Worthington for example, when even most recruiting services listed him at his true 6'8 or so.
But none of the idea that basketball players are all listed taller is sound evidence though. Just speculation about Austin.
He's listed at 6'11 and it has never been updated. Austin himself confirmed that he was measured and he had grown. Why they didn't change it i don't know but the people working on rosters have been all nuts this last year for both basketball and football.

There's really no argument unless there is something to back up Austin lying. Just saying "no he's not" carries no value.