nice, i found something similar with Boxer’s OH, FADC fwd.dash into the corner.
The way it works (after watching it in slow motion), is doing attacks that cause a decent amount of blowback (like horizontal blowback) where their entire hurtbox/clipping hitbox no longer occupies the space they were once in, then, the attacker quickly occupies that space before they snap back. What happens is that the clipping boxes try to occupy the same space at the same time and since they can’t, one character will teleport through the other. In slow motion, it literally looks like they teleport through each other in a single frame.
I got it to work on crouching Guile and crouching Cammy in the corner, dunno if it works in 2012 though. I had to do the same thing with delaying the FA release into fwd.dash with Cammy.