Maybe they really was comparing the dominance position only, not being a usable alternative. Although Firefox does not work for everything and Chrome or other browsers are required instead (such as streaming with Xbox games in browser), so there is that. If we only speak about market dominance and the ability to change that, yes, then I agree that Firefox/Mozilla is not in a position to do that at the moment.

Firefox should be used alone for the fact that it has superior addon support for ad blockers. That's a real world difference and reason, not just some ideology (as it was it in the past for me).