Didn't Strange get snapped? I'm fuzzy on the timeline, but it seems that all the people who got snapped are starting to reappear at the beginning of WandaVision. Maybe he's still snapped. (Sorry, I'm not sure how the whole 'snapped' thing works or if everyone is supposed to be back.) Maybe he's off in another dimension and is unaware of what's happening in New Jersey. I assume we'll find out soon enough.