I mean, it’s not like they declared FLoC a-ok, rather the opposite: https://blog.mozilla.org/en/mozilla/privacy-analysis-of-floc/

It’s just not useful either to declare any proposals from Google or Microsoft to be shite and not worth discussing. Because Google and Microsoft will implement their standards anyways. So, discussing it and pointing out why these proposals are shit will help to maybe convince some non-technical people to switch to a respectful browser.

https://blog.mozilla.org/en/mozilla/privacy-analysis-of-floc/