Short Squeeze??eNo short squeeze. Chuck most likely was "shorting against the box" i.e. shorting against his own shares he owned. That is a clear strategy to drive down the stock for rollback.
You could not borrow any sizable Mtx shares for shorting. Who the moron would short a 5 cents stock? Chuck will end up in a zero "delta" position after flating out his shorts but in pushing the stock down as his primary intention. While that tax gimmick is gone by IRS and CRA, it is another way for a promoter to depress the price of any stock,