While I hope you are correct, as I think he would poll much better than a second Biden run, I wonder how you can be so certain. I see plenty of news articles (opinion pieces) suggesting otherwise.
Here are a couple...
The incumbent governor faces a cakewalk this year, and part of his brain must already be thinking two years ahead, Thomas Elias writes.
news.yahoo.com
California Gov. Gavin Newsom may be just what the Democratic Party needs to win the 2024 presidential race if Joe Biden is no longer in the picture, strategists say.
www.foxnews.com
Maybe you are right, and his attack on DeSantis is just some kind of futile attempt to stop the stream of people leaving California for Texas and Florida.
Personally, I think Newsom would be a force to be reckoned with, even though I can't stand him.