Yeah, I am very well aware of GraphenOS’ teams hostility towards other security and privacy projects. I do believe that attitude is harmful, and not very trust inspiring. It is true Whonix does not really contain any significant security hardening beyond the workstation and gateway isolation, and none of those posts claimed Whonix or KickSecure is less secure than Debian, so nothing they said there is wrong. But it would have been possible to say that, while still encouraging and supporting other security and privacy projects. I do believe Whonix has a very important role, and the workstation-gateway isolation is very significant. I also believe GrapheneOS has a very important role, being the only security and privacy focused Android fork left now after both DivestOS and CalyxOS are no more.
I have personally audited GrapheneOS for security issues multiple times. I judge the GrapheneOS team to be very competent, the security and privacy posture of GrapheneOS is very good, and they handle reported security issues seriously.
I am not going to speculate about whether Daniel Micay has any mental health issues, I have not heard anything credible about that, just slander. I have also heard no speculations about mental health issues among other GrapheneOS developers, including the lead developer.
But I want to say one thing: Do not underestimate what a person can accomplish despite serious mental health issues.