A large company going bust doesn't imply that demand for other public companies was somehow fabricated.
The more apt comparison here would be something along the lines of the recent run up in TSLA being the result of purchasing from the infinite margin bug from Robinhood a while back. It would turn out the demand wasn't real, only there because it was free.
The implications for Bitcoin and other crypto also purchased with Tether, or with Bitcoin are a lot bigger than you'd imagine.