How would you differentiate that argument from similar arguments about other observable phenomena? As in… No one has ever seen or otherwise directly experience

How would you differentiate that argument from similar arguments about other observable phenomena? As in… No one has ever seen or otherwise directly experienced the inside of a star, nor is likely to be able to do so in the foreseeable future. To be a star is to emit a certain spectrum of electromagnetic energy, interact gravitationally with the local space-time continuum according to Einstein’s laws, etc. It’s impossible to conceive of an object that does these things that wouldn’t be a star, so even if it turns out (as we’ll never be able to know) that Gliese 65 is actually a hollow sphere inhabited by dwarven space wizards producing the same observable effects, it’s still categorically a star. (Sorry, miss my philosophy classes dearly!)