Just in case anyone wants to read more about this, a Southern California newspaper covered it and @ee-ea is of course correct.
https://www.ocregister.com/2023/04/11/california-taxpayers-why-does-accountant-insist-i-file-now-ins...
Update: Sorry, I just noticed that the article is behind a pretty painful paywall, but they basically interviewed someone from the IRS and verified that everyone in California except the several listed counties get an automatic extension for both federal and state taxes this year.
