In a political context, "credible" is often a synonym for "agrees with me". Anyone ranking "page quality" should be conscious of and try to avoid that, and yet the word "bias" doesn't even appear in the linked guidelines for Search Quality Raters.

Of course Google's own bias (and involvement in particular political campaigns) is well known, and opposed to Project Veritas, so it's quite possible that you are right and Google is downranking PV.

Would that be good? Well, that's an opinion that depends mostly on the bias of the commentator.