Unless those were actual corrections based on later findings of fact, that's unethical at the very least.
Don't you see, that's the point? Kerry is UNETHICAL, a traitor, a liar, an opportunist, someone who say and do anything to get what he wants. His whole tour of duty was a sham to advance his political ambitions. He had a Walter Mitty fantasy of following in the footsteps of John F. Kennedy and he was living out that fantasy by manipulating events to mirror Kennedy's service.