It might be breaching some rules, particularly to do with the chapter 11 thing, but i dont think insider trading is the correct term. When would a CEO selling shares in the company that he heads NOT fit the definition of insider trading?
"Insider trading" is of course the correct term for an insider, well, trading.
There is legal and illegal insider trading. Insiders have to follow certain rules for trading shares, and if the rules are followed, it's legal. If the rules are not followed, it's illegal.
Plus, the top management of a company should avoid things that might give the impression that they might be illegal even if they are not. And there might be some question of whether the company delayed the bankruptcy announcement so that the CEO's share trade could go through at a high price; that would probably not be insider trading but stock manipulation, which is also illegal.