definitely not an illusion aizen is grabbing her arm so there's that
Yes, Aizen blocked Soi-Fon's blade and even then, her attack requires her to actually cut the opponent @Cryso Agori
As for Askin, I'm not even sure what Pax is on as per usual, we can't pretend The DeathDealing should work on people WELL above Askin's level of power, especially when they can basically one tap him.
This is especially obvious to people who can be immune to the shit he does.