Is she actually denying that they're fake? If so that's silly as shit.
I think it's more not talking about it. She really isn't that attractive without the boobs. Her smile is ridiculous and forced (surgery?). Her eyes look like she is terrified of having "slanted" Asian eyes so she keeps them wide open (also surgery?).
Without the boob gimmick, she'd just be a random female personality with views barely above average Joes trying to become YouTube famous.