True, I should have been more careful with my wording. My point was actually that unfalsifiable metaphysical statements are not invalid in the same way that unfalsifiable physical/scientific statements are.

So yes, some metaphysical statements are falsifiable, and some have in fact been falsified over time. And, very importantly, many of the biggest metaphysical questions have no known falsifiable answers (at least none that are not already known to be false, of course).