It's after hours trading, which is very low volume and generally not available to most retail investors. Probably just another hedge fund getting in their shorts at these high prices. The FUD spread due to the plunge in after hours is just a bonus for their new short position.

Further, I think everyone is drastically over estimating the impact of r/wsb and retail investors in general on the GME action. This is hedge fund vs. hedge fund in an opportunity for unusually outsized gains on both the long and short positions over relatively short time frames. Good for them to keep the narrative focused on retail investors rather than capitalist titans in a financial blood bath.