Positive feedback has no value if the account gets tagged. I'd expect less high profile accounts to be able to stay under the radar longer. Just like claiming to be
John Arnold will alert less people than claiming to be Bill Gates.
For someone who looks at his account from outside, everything looks almost perfect.
They can see 17 positive and 2 neutral feedback, there is no negative and that is enough for most people.
I see no other reason why someone would change username and do so much effort in deleting bunch of stuff he wrote before.