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

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?