That's what I meant by "validated by this source". But unlike with CAs, where they're (meant to) just base issuance on the simple objectively testable criterion

That's what I meant by "validated by this source". But unlike with CAs, where they're (meant to) just base issuance on the simple objectively testable criterion of whether you control the domain in question, an external authority cannot easily know whether a video represents real events, whatever that means.