The statement from b1tr0t directly refute that Google is contributing to MDN, as they put it: "Fully agree with you that docs are all over the place. We've started to consolidate docs under web.dev". As far as I know, web.dev is not MDN and has nothing to do with MDN.

Mentioned in another comment, but to be clear, our team contributes to MDN, and will continue to do so.

Web.dev is not an MDN replacement.