[_ea1k]

Honestly, I think you have a point. It would go back to what the reason was for termination. SpaceX has indicated that the terminated employee's actions went beyond simply writing the letter.

I do not take company statements like that at face value, as they have their own interests to protect. However, it does leave the possibility that termination was not related to statements about working conditions.

The former employees may have a case here.