All those characters are still tier 2 with the same justification.
Well yes because in their cases, they were proven to be effecting the space-time of the universes involved. That, and unlike here, they actually succeeded in doing it, which would suggest they were able to display this or have its details known.
Nope, it hadn’t reached that point yet. But I don’t see the issue here. Why are assuming it’s all a lie that wouldn’t have happened?
Its not about it being a lie, its about what you said actually. Yhwach had not reached that point in merging the space-time of the realms yet, so that doesnt give us a 100% guarantee that he would have or could have done it. For all we know, he could have attempted it to only fail, or take a considerable amount of time to complete it.
The only real basis to the feat happening is him planning to do it.
Same as above; you’re taking advantage of something that was mostly narrated. If any of those things occurred the verse would disappear.
Not really. An extraordinary claim like this would need that kind of extraordinary evidence, and just like it is with many world-merging feats, the worlds being merged to the point where they can be destroyed doesn't mean we cant be shown it's space-times or dimensions being mixed in with each other to convey that.
The one with the dimensional earthquake and when he got really angry and tried to end things before he was shot.
I presume you mean what happens in this chapter right?
He was planning it true, but we see him in the process of doing it. Several other characters reiterate what is going to happen should he finish. He was stopped before he could.
Yes but if we go off of what was displayed, the only things seen are Yhwach's black auras spreading throughout the soul society before he was plot arrowed. Not even an indication of space-times starting to be warped, fused, etc.
The point here being that we dont know what would have happened had Uryu not interviened. High claims like this need high amounts of evidence, and this is all we have to work with.
It’s a common trope for villains. Like Cell saying he is going to blow up the star system but didn’t get the opportunity too at all.
In fairness, Cell has a large quantity of sources specifying that he would have destroyed the solar system with his attack against Gohan. But to go beyond that, a key difference here is Cell was very close, if not, in 4-B tier when making that claim, which would help substantiate the idea that he would be able to.
On the other hand, we have Yhwach who's next best tier outside of planning to merge the worlds is tier 5 feats, which makes his case a lot more skeptical in comparison to Cells.