How would that be acting in an official capacity other than subverting separation of powers?

Of course it is official business. He is protecting democracy.

Also the new ruling mean you can't question the president as it his reasoning for his actions.

i don't think that's included in "official duties".

it doesn't matter. the trump heuristic is the only way some people perceive the world. then they'll suggest some insane nonsense which is actually bad but they'll justify it with the trump heuristic