I certainly could have done a better job trying to convince you of that in that post. Perhaps my follow-up was better? https://groups.google.com/a/chromium.org/g/blink-dev/c/Ux5h_...
FWIW the whole reason I keep working on the web platform at Google is because it's the place I think I can do the most good for openness on the web. See eg. https://thenewstack.io/browser-vendors-aim-to-heal-developer..., https://www.chromium.org/blink/platform-predictability/. "The Master Switch" my Tim Wu is my gospell.
If I and other chromium leads didn't actually care about openness then you'd be able to tell pretty clearly because Chromium would be closed source, we wouldn't have big programs like wpt.fyi, and we wouldn't bother even trying to talk about this stuff on open mailing lists.