Most likely not. Are there historic matching posts in the archive? If so, that would pretty much completely allay my lingering suspicion.
Also, his campaign doesn’t exactly seem to be the most tech savvy. They tried to blame this on AI Generated images, which doesn’t even make sense as a possible attack vector for faking this kind of evidence. I doubt they even know about or understand internet archival sites.
Good. This is the same as a pharmacist refusing to fill a prescription due to personal beliefs. You took a job knowing what it would entail.