Yep. And that's far from the only way it could work out badly. I talk about this a bit in the section on "Bluesky is a useful counterweight to Threads"
Bluesky is far from perfect. They're venture-funded, so likely to end with an exploitative business model. They've got a surveillance-capitalism friendly all-public architecture. It's great that Jack Dorsey's no longer on the board but he was.
It's true that downballot Dems ran ahead of Harris in most states. Why do you think it's statistically unlikely? Polls ahead of the election showed downballot Dems were more popular than Harris. Republicans focused most of their negative campaigning on Harris. Biden's very unpopular and she didn't try to distance herself from him (I'm not saying that she should have, I'm just observing that she didn't). Sexists and racists were less likely to vote for Harris.