Likely they mean censorship via certificate revocation, which it isn't clear yet that this is, but they have a valid point. If you put control over your trust in a third party, you give them the power to do this kind of thing.
Plus, they won't remove the functionality to manually trust a cert (Business Users would complain).
Firefox has implemented the same rules around .dev tld's as google. I use vivaldi when accessing internal company .dev domains because firefox won't let me tell it to accept the self-signed certificate.
Well, another argument in favor of not overloading TLDs for internal domains, then, and just buying an additional domain if you really want to have separate internal and external domains.