I have a question wrote:So any misuse of the Theorem can only have been deliberate.
Nah, not necessarily. I looked up Brian Dale on ResearchGate and what he has are 80 very narrow, technical papers on specific medical applications of MRI. Eighty papers would be a fairly large number of publications for someone his age in my field, but this is the kind of thing that differs a lot between fields. He actually works for Siemens, and I think corporate researchers tend to pump out a lot of stuff pretty steadily. Most of his papers also seem to have quite large author lists, so his individual contribution to each project may have been very specific.
I'm sure he's a very competent guy at what he does for a living. To be that, though, he likely doesn't have to have a clear grasp of how and why Bayesian inference fundamentally works. Quite a lot of unsalvageably bad analysis happens when a narrowly expert technician naïvely applies familiar methods in an unfamiliar field. Even though the glaring errors in this paper are outrageously glaring, they're very likely the kind of errors that just never come up in medical imaging. So Dale's never had to think about them before, and he figures he's an expert in this kind of method, so he didn't stop to think of them now, either.