Billy Maximoff Knows Everything

Okay the title doesn't say much other than the fact that it's based on Billy from WandaVision but I had a thought that if billy was like his mum then wouldn't he be somehow aware of what's happening in Westview?
Also Billy and Tommy do not die in this...
The fake Pietro is actually the one from the X-men universe
Dr strange will show up in some part of this...
DISCLAIMER: I DO NOT OWN ANY OF THESE CHARACTERS.