One thing to note is that on his player page's career stats window it shows 17786 points. In team history page it is over 20k yes, but that is only accessible to supporter teams. I don't know where the extra stats come from there, maybe bbm matches?
Regardless, I checked some historic NT team players from my country and no one has more than your guy. I feel like to beat your record it has to be a player from lower division, who has been stat padding a bunch of +30 ppg seasons ;)
Yeah, stat keeping on BB is absolutely atrocious. A players stats differ from the career stats window, the hall of fame page, the team history page, etc.
It would be great if once and for all they would just provide us an accurate statistics page (and it souldn't be too hard...).
And yeah, that pretty much matches the profile of my guy. My utopia team is an U21 player farm, so I don't really care about promoting. He's had one 50ppg season, and a bunch of 40ppg seasons.