That seems somewhat unlikely. Only a few insiders would realize the full dimension of the accounting fraud or the implications of some obscure figures, insider sales are reported and ones which aren't part of pre-planned sales are often noticed, to singlehandedly tank the stock would require a lot of sales, and why would these insiders be avidly following the tweets of a relatively obscure short-seller and instantly commit a large fraction of their net worth to a sale based solely on the possibility that a random tweet refers to them?

Hard to tell without knowing what happened to other like companies. Perhaps they all went down on the news? If so it wouldn’t make me feel any better About those others.