As marcis mentioned, the custodian didn't do right by shareholders. He didn't even call a required shareholder meeting for starters, but there are numerous steps afterward that were also not doing right by shareholders.
But my bigger point that is being consistently missed is that a shareholder derivative suit doesn't mean that shareholders can sue anyone that causes harm to the company. They can only cause corporate insiders that cause harm to the company. A fellow shareholder has no duty to anyone and therefore can't be sued by the company as you are suggesting.
I'll add that being a former director or officer makes no difference as they were not in control, hence the "former." You can only sue Calasse for things he did in 2013, not for anything that happened in 2022.
If someone can't tell that a shell is a shell, can you trust anything else that they say?