It works with the indestructible walls in City of Skulls, so I don't see why it wouldn't work here.
Sounds easy. I say grab the chance when you have it.
Also, I reckon he happened to be generated on that one hidden staircase leading to JC.
(Why did I even use the spoilers? I've said before that they're unnecessary.)
Kornel could make it to spawn a teleporter next to the staircase: The Cyber walks on it, and gets out. Or give him a phase device in the beginning of the level, though then he could also use it to escape the player, so it's probably not that good of an idea. The only ways I see out of the bug, regardless.