Yes. Yelena appears in Hawkeye, which is set after Infinity War and Endgame. That theory never made sense anyway.

I didn't know that theory even existed

It is based on why Nat had Yelena's jacket.

Ohhh... yeah it makes no sense.

Still dumb.

Sure, cuz Clint Barton would get the soul stone for somebody he DIDN'T even KNOW.