> It's not about what is being signed, it's about who signed it
Yeah, that's what I said about PKI. I also said there is confusion between provenance of a statement and its accuracy. Just because it's signed doesn't mean anything about its accuracy, but those that confuse the two will think that just because it is signed, or because it was signed by a certain "trustworthy" party, that indicates accuracy. PKI does not establish the trustworthiness of the other party, it only gives you confidence in the identity of the party who signed something.
George Santos could sign his resume. We know it was signed by George Santos. And yet nothing in the resume could be considered accurate (or even a falsehood) purely because it is signed. That it was proven to be signed by George Santos via PKI is independent of the fact that George Santos is a known liar.