I'm not familiar with either of those meanings. To me it means something like "irrelevant".

Then you probably are a speaker of American English. Another meaning in AE is "a fact or question that's of little practical significance".

All of these have in common that they're more less the opposite of "something controversial or worth arguing about", which is the British English.

> Another meaning in AE is "a fact or question that's of little practical significance".

That is a meaning of "moot", but "hypothetical" is not. The word "another" was probably ill-advised there.