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If it's not true, it is libel or slander depending on how it was delivered.

It may be that Twitter's HR records say "fired for cause: ineffective leadership and poor performance" in which case the statement would be technically true.

It's much more likely that Twitter's HR records say something like "fired, not a good fit" in which case it's back to reputational harm.

If the HR records say that, and it’s not true, that doesn’t get twitter off the hook. It might make it harder to sue the CEO directly though, depending on who was involved in writing the HR record.

I'm sure there's lawyers somewhere willing to take the case, perhaps even pro bono, just for the publicity.

Discovery would be hilarious.

It’s 100% true though:

He was ineffective at keeping quiet about security problems to governance parties, and performed poorly at persuading peers not reporting to him to fix things they weren’t incentivized on.

Probably not, because it's an opinion.