There are two things to consider here.
1. The statement about destroying several planets was made about Buu in general. We don't know if Kaioshin was referring to Fat Buu or Buu's original form, but from a narrative perspective, Kid Buu wasn't even revealed at that time and the very first introduction about Kid Buu was given by Kibito-Shin later in the scan you posted. So, it would make a whole lot more sense that Shin was talking about Fat Buu when he mentioned that he destroyed several planets.
2. Bibidi not being able to control Buu would only mean that Kid Buu didn't listen much to Bibidi and did whatever he wanted to do. If he was completely uncontrollable, Bibidi would have been dead. But as he said, Fat Buu became gentler and more reasonable so it was easy for Bibidi to make him listen. Though still, even Fat Buu was hard to control as we saw in just a few hours Babidi ended up being dead.
None of that says Buu destroyed several planets flying from one star system to another by himself. Once again, this is just your assumption, which might be true according to your interpretation of events. I am not denying that a slight possibility exists. Although, that possibility is not enough to make the feat usable because there are other more reasonable possibilities which make more sense.
We will agree to disagree. You're not changing my mind, and I am not changing yours. My job is to make you aware of why we don't use that feat. And you are free to disagree. But we cannot change everything that was already discussed and decided previously because a new member comes in and disagrees with it. If we did that, we'd be constantly changing one thing or another. Most of the people involved in this decision have come and gone, and many people currently active don't even want to keep debating DB because of repeated discussions. So the only thing left for me to say is that you can accept that this particular feat was deemed to be unusable as a feat, even if you personally think otherwise.
This translation says "death of the universe" and the other one said "the universe will be destroyed". It is pretty clear that the meaning behind both translation is that he is referring to the destruction of the universe, not destruction of all life in the universe. To which I'd say it's an exaggerated statement which we don't consider reliable. He also says that Buu will reach Kaioshin realm, which should be
impossible since the only way it can be reached is via Goku's IT or Kaioshin's teleportation, not flight, also proving that it is unreliable. And Goku even contradicts it later saying that Buu won't be able to come to Kaioshin realm.
In your latest translation, it says "we can restore the planets he blew up", talking about past tense. I'd say this isn't reliable translation because it does not make sense. The earlier translation says "we will undo the harm he will do". In any case, nothing suggests Goku was talking specifically about planets with life. Buu can destroy whatever he wants and Goku would still undo the harm in a single wish whether it is any planet with or without life is not relevant.
Conflating two different statements is reaching. Both statements are true in their own separate contexts.
We don't consider the title as anything noteworthy because they are purely for hype. And even so, Buu was a threat to the universe, nobody is denying that. He could be a threat even at his current AP and speed.
He is MFTL, he only needs some days to go to the next solar system and destroy more planets. Even if Shin was talking about Buu flying on his own, his current speed more than factors it in. Even by your own calculation the low end is only FTL+, which is slower than what he is rated as.
I don't see a point in dying over whether we should treat this feat as "accurately usable" or not, because in the grand scheme of things it doesn't matter.
That is all from me on this topic. Frankly speaking, my job is not to convince you to change your viewpoints and make you agree with me. My job is to tell you why this feat has always been treated as too dicey to be usable in any accurate capacity. If you can't see that or you don't agree with it, that is fine. We will agree to disagree. But we cannot change something already been established by so many people over so many years because a new member joins once a month and tries to change the ratings. Notice how no other staff members who used to be present in earlier DB threads even show up anymore, except for Medeus and I. It just gets repetitive. You'll have to accept that what you think is legit was already deemed unusable and nothing new has come up since then. You can go ahead and have the last word but I won't be responding to this topic anymore.
@Antvasima We'll have to make a discussion rule about not trying to upgrade DBZ speed. We literally had an exhaustive discussion over it last year with SSJRyu and came to a compromise only to witness another upgrade thread few months later. We already decided to highball the speed enough already due to multipliers when the best feat is rel+ and seeing how this keeps coming up and there are not a lot of staff members willing to participate and I hear regular complains about multiplier abuse, I think it is time we ban this topic after this thread.