This is a continuation of Bill's campaign: https://twitter.com/BillAckman/status/1742441534627184760
Reminds me of a couple of other notorious political comments by VCs recently.
This is all kind of beside the point, though. How you feel about this pretty much comes down to whether you support or don't support Ackman's crusade against university presidents over things that are entirely unrelated to plagiarism.
Citation? The most cutting-edge AI still has an enormous margin of error, entirely unsuitable for accusing people of "plagiarism" without additional evidence.