I wouldn't either. But it is kind of apt, since the foundations of mathematics are probably just as murky as the nature of UFOs/UAPs. How do we know that 2+2=4? What kind of fact is it? (Perhaps one that might cause materialists a bit of heartburn.) How is its truth justified? Yes, it works, so there's the 'indespensability argument'. But that doesn't really answer the questions of what kind of reality mathematical facts have or how we know about those facts. (If facts they are. I'm a bit of a mathematical Platonist in that regard.)
https://en.wikipedia.org/wiki/Quine–Putnam_indispensability_argument
The thing is, nobody really knows what the facts (in the sense of objective realities) are in the case of UFOs/UAPs. All we have are beliefs and hypotheses about their nature. We do have all kinds of observation reports which are facts in their own way, but it isn't entirely clear what they tell us about the nature and reality of the underlying phenomenon.
I think that one place where MR gets the 'skeptics' backs up is how he takes the observation reports more seriously than they do. If somebody says an object moved in such a way, he takes that as evidence that it really moved in that way. If an observer says that it appeared metallic, he takes it as evidence it was metallic.
I see nothing wrong with that. It's certainly as justifiable as simply assuming that for some reason the observation report must be an error.
Perhaps we need to be more clear about the distinction between facts, belief and hypothesis.
Facts in the sense I am using it here are objective realities.
belief then is what is asserted to be true about those facts, about that objective reality. (Or a mental state that motivates one to make such assertions, or something.) People often use phrases like "I'm just stating the facts" but literally that's impossible. The individual is simply stating what he/she believes about the facts. (That's the human condition.) That belief might be well justified or not justified at all. Knowledge is a subset of belief, consisting of those beliefs that are both true (something that can't be directly known) and suitably well justified (which opens a big can of worms).
hypothesis is a speculation about what the facts might be. It isn't an assertion of truth, but rather of possibility. I personally think that while we should be circumspect about what we assert to be true, we can be much freer in asserting what we think might be true.
What MR seems to me to do is propose hypotheses (very unwelcome hypotheses) about 'fringe' phenomena. His hypotheses might actually be more consistent with the obervation reports than the more dismissive hypotheses of the 'skeptics'. Which is why they seem to always be in such a rush to discredit the observation reports, I guess.
But while I have no objection to creativity in framing hypotheses, I do think that we need to seek out justification before we adopt the belief that they are true. ('Might be true' is a different matter than 'is true'.)