If it’s an official act, yes. It’s not hard to tell a story where it becomes an official act. I I think he could still be impeached FWIW.

Because of Trump’s unhinged tactics, we know that top military leaders and (presumably) TLA bigwigs have discussed what they would do in situations like this. What you’re describing is very close to a coup d’etat, and in a situation where they get ordered to perform such an action, do they do it? What was framed as a question of SCOTUS rulings becomes, in reality, the question, “Am I willing to throw this entire democracy away on this President’s absurd orders?” Every high-up in government knows this… They signed up to serve the people, not a dictator.

Of course we have no idea how each person would act, but my point is that pure legality is only one challenge Biden would have to overcome if he wanted to do such a (horrible) thing.