My thought reading that was, yeah, it sounds right (and is well-put), but not really surprising. I've seen Krugman make all of the first four points previously, and at least discuss 9 as a serious possibility (and I would have assumed he believed 6 and 10). It's a great sign of how things are changing.
Also, Obama had short-run austerity forced on him, and I think Congressional Republicans' actions in the Trump years show that a big part of that was just a desire to hurt the economy while Obama was in the WH. But he did rhetorically go along with it (celebrated falling deficits, for example), and his offers did tend to be about trading short-term stimulus for long-term debt reduction so still arguably fair to say he embraced austerity, but kind of oversimplified.