Fair enough; Nae True Scotsman is always annoying, and big-R Rationalists aren’t any better at avoiding such fallacies than anyone else (to their credit, the ones I pay attention to are also annoyed by this).
What I’m seeing is mostly online rather than in person meetings; these discussions are “could we have spotted this nonsense sooner?” (general consensus: “probably not, his investors and auditors didn’t and that’s not our skillset”), and “hang on, wasn’t this[0] a red flag?” (which generally gets left unresolved as they get nerd-sniped on the actual discussion rather than staying focused on if it should’ve been a warning sign).
[0] https://forum.effectivealtruism.org/posts/mdbSL9o8H2Z5mjKaj/...