I can answer this a different way. I think it's very likely Jamie was scumRB'd because Jamie had a lower level of activity than his normal meta D1. I noticed it but didn't say anything; other people noticed it and spoke up. I think it's very reasonable scum might PR-read Jamie for "lurking" and RB him.
I have no reason to think Jamie is or is not a PR; I think his posts actually suggest he is paying close attention to the game and just posting less than usual, possibly because of life or an attempt to change meta. But I know there's a vein of thought that PRs try to look scummy/keep a low profile, and as such, I think Jamie's activity is something scum might notice, and therefore, more likely Jamie was the one scumRB'd.
All that, is in addition to my guess at the TRB.