That's interesting, and a useful update.

On thinking about this more, I suppose the LOO/k-fold/split-sample question should depend a lot on a bunch of factors relating to how much signal/noise you expect. In the case you link to, they're looking at behavioural health, which is far from deterministic, where events like heart attacks only occur in <5% of the population that you're studying. And then the question-asker is trying to tease out differences that may be quite subtle between the performance of SVM, logistic regression, et cetera.