You don't have to be frame perfect with the armor. That's what the Reversal system is for.
Also, you just have to make a read. Generally, if someone is +, they want to hit buttons. In this game, anything that isn't a true frame trap can be armored.
you can reversal after blocking something, not after getting hit by something. To land this you actually have to be on frame
I just tried to armor after a D3 into B2 and after about 50 tries I could not find the timing
I think anyone attempting this is making an unnecessary risk, especially since this IS a true frametrap if done right and at worst is extremely hard to armor like 1 frame or 2 window only of your opponent messes it up by even more, AND only beats one option of the 50/50 anyway
I'm not claiming to be better than anyone from YOMI or anything just wondering if the people you are talking about actually know that it jails , or if they are just mashing armor after seeing you press D3 and maybe u happen to be a little off with the timing?