Thank you spaceman for still following the thread. Since you are reading this I'm gonna explain more stuff.
You can see where Rimuru talks about how this FTL-speed phenomenon shouldn't be possible since the speed of Information Particles is constant, showing that Information Particles either travel at SOL or below that speed. He first theorizes that it may be possible because the laws of physics do not exist in the Stopped World, but then immediately rejects that idea by saying it shouldn't be possible since Information Particles' speed is constant. This shows that Rimuru has never seen Information Particles traveling at FTL speeds. That literally debunks the whole infinite or immeasurable speed interpretation for Information Particles that OP is trying to argue.
I also need to point out:
In this scan, Rimuru is literally talking about how Information Particles 'appear' to exceed the speed of light. You can also read it as look like they are exceeding SOL speed. He then immediately corrects that interpretation by saying that it is not because their speed is faster. Instead, he says it feels like that is the case. He is explaining why their constant speed creates the appearance of faster than light transmission, not that they are literally traveling beyond SOL speed. Also, the "zero time delay" statement is being taken out of context.
Check this scan where a time delay was occurring because Rimuru did not yet have full control over Information Particles while time was stopped, and Ciel had to send Information Particles out to gather information and bring it back. The whole "zero time delay" point is about the fact that, if you can properly manipulate Information Particles, you can perceive, move, and operate inside the Stopped World without experiencing the kind of time difference shown above. That's the entire point of the explanation.
In conclusion: The zero time delay or exceeding SOL was never a thing. It was just how the constant speed of Information Particles looks and how moving even in a Stopped World wouldn't cause any delays to others. It just gives the impression of that, which is again, as I said, backed up by the Volume 23 statement where FTL speed shouldn't be possible for Information Particles since their speed is set as constant. So they are either SOL or below SOL speed.
Also, "to any point in time" seems like just the translator's choice of words (Riakou is free to comment on this) since the Jisho site shows different meanings for に, which can also be read as "at."
jisho.org
Even that doesn't change much, as I already mentioned. It's just talking about how they can move in any situation, not that the author is literally trying to convey them moving beyond linear time to grant immeasurable speed here. If that were the case, he wouldn't be hyping up FTL speed.