They mix up Google-vendor (pixels are absolutely the best and most unlocking-friendly hardware at this point), with Google Play Services services/limitations (ie dominant player in android ecosystem) AND Google, the dominant contributor to AOSP project.

And it's also partially false, as Gemini works just fine after unlocking/relocking, and all the advanced features (full performance of the cameras, NPU access, secure element) work even on non-Google OS. Things that do not work (mostly wallet) are valid issue, but then again, they work just fine after flashing OEM firmware And relocking The bootloader.

So I can only guess the quality of the contribution is similar with other phone brands.