he was called daler69 because his clan was called star69. but he did also use 69 as fov, whether it was because of his clan or his love of a certain sexual experience I don't know.
High rg accuracy in itself isn't a great indicator. I have on occasions been hitting 80-90% RG for a few minutes in a row while doing mid railing in CTF, so it's possible if you're good at railing and get a bit lucky. If he was doing it just for the sake of a high rg accuracy, then it's not that hard to pull off.
Though, considering his mg and shaft aim are total shit, it does raise a question mark.
The 90% could be suspicious, but not impossible if the guy is good at railing. He could camp the whole time and be useless at movement and other weapons.
Regarding the impressives, seems fairly normal to me in a long game of CA. (if the final score is 10 to 9, that's roughly 1 impressive per round)