I didn't say we will never understand it, although it is certainly a possibility. One might argue that Godel's incompleteness theorems suggest a reality where some things are unknowable.
I appreciate your point, but I think invoking Gödel's incompletness theorems in this context is taking them far out of their scope.
I guess that depends on what you believe Mathematics to be. Is it a representation of reality itself (maybe the ultimate reality) or is it just a human construct? I don't know.
It's a theorem that starts off with some assumptions, and gives you some implications. It does not say anything as general as "some things are unknowable in mathematics".