It means whoever hoisted it considers there to be a crisis, which is consistent with accounts of public offices being overtaken by random young white men who are rapidly taking control.
Speaking as a non-American political scientist having worked a little with rule of law and fascism, it seems a bit late to start worrying. Think about what you can do for yourself, your neighbours, and your country, urgently or in the longer term. It's going to be ugly for a while.
#3 depends where you are on the hit list I suppose. I'm trans, so I'm well past worry-o-clock and am actively making arrangements to leave the country. Someone like a cishet white male tech worker has a lot less to worry about though
That looks like a PieFed bug - the leading # should normally not be parsed into a headline in Markdown unless it is followed by a space. I'll give @rimu@piefed.social a heads up!
That said, there's every reason to scream at this point. I wish all Americans seeking to flee the country the best of luck.