Last I checked he announced his departure only to rescind that announcement later. For example in the discussion about the shutdown of the Mozilla location service he was active and spoke for the project, completely derailing the issue with versions of the accusations the video depicts as well, which was afterwards.

I am always a bit sorry when I have to bring this up, that is why I only mentioned it when prompted. Mental health is a sensitive topic and hammering the problem won't help him, but it is just so relevant when users rely on the security of their system, even pick Graphene because of heightened security needs.