The Google Project Zero blog post implies that all Google Pixel models have received a fix, but really only some of them have, and it doesn't mention that the vulnerability can't be mitigated on them either. The 9to5Google post gets both of these things right, though: "the Pixel 6, 6 Pro, and 6a have yet to see that March update" and "Google Pixel devices received software updates in 2021 that automatically enabled VoLTE and removed the toggle."