The claim that Melvin closed their position is something of a game of "telephone" in that it was a CNBC anchor that claimed that "from what I understand" Melvin Capital is out of the stock, after he talked to the CEO (off camera).
Importantly, there was no recording of the conversation, just a journalist claiming a source said something. The fact he used "from what I understand" instead of a direct quote is telling.
Melvin themselves have not (as far as I can see) issued any kind of statement, written or otherwise, that clearly states they have zero position on GME any more.
All of the other stories about the claim simply state "according to CNBC".
My point is that as far as I can see, there is no evidence that Melvin are actually out of their position, other than easily-deniable comments that a single journalist claims "from what I understand" on.
Link here to the video from CNBC: https://www.cnbc.com/video/2021/01/27/melvin-capital-sells-o...