I mean they probably weren’t doing anything except rapidly trying to sell their stock options that had 100x’d. They more than anyone knew they weren’t worth $325 a piece.
See Rule 10b5-1
I would find it hard to believe an accusation of "insider trading" if an GameStop officer sold a bunch of stock last week, rather than the much more likely public-information explanation of "we're definitely not a $25B company and everyone knows it".