I find it hilarious that "short squeeze" is a concept that is supposedly well-defined and inevitable if certain market conditions are met, but at the same time so ill-defined that we cannot tell whether it has happened.
For whatever it's worth, https://en.wikipedia.org/wiki/GameStop_short_squeeze says it definitely happened, but at the same time it offers zero sources for its claim that "the rush to buy shares to cover those positions as the price rose caused it to rise even further".
It was never going to happen. Look at the volume of shares that have been trading. There has been ample opportunity to cover any shorts. The conditions to force a squeeze never existed.
Furthermore, has anyone actually demonstrated Melvin actually shorted the stock? It would seem like they owned a few puts. Puts don't get squeezed, they just expire out of the money.
short positions do not have to be reported to SEC, so you just can't know. there's ample evidence that melvin's short positions have been closed at about the time GME rose to $150 the first time - a lot of other stocks enjoyed the same general upwards movement indicating somebody closing a diverse lot of shorts.
It's desperate people trying to tell themselves that they're going to be rich soon against all evidence. It's why the date for the supposed squeeze keeps moving.