The history of the game of chess knows around 30 players who have at some point exceeded the dream mark of 2600 Elo points.
On the other hand this https://en.wikipedia.org/wiki/List_of_chess_players_by_peak_... puts 125 at over 2700
Grandmaster rank is achieved via a peak Elo of 2500 plus gaining two grandmaster norms[1].
[1]: https://en.wikipedia.org/wiki/Grandmaster_(chess)#Current_re...
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"Anonymous Confessed GM"s on the cheating list, most of them with a rating much higher than Neimann's.
The highest rated "Anonymous Confessed GM" in this table in the report is a 2686 Elo.
the are proven cases of gms selling/throwing games so you can earn norms for gm title (understandable phenomenon when considering effort of getting to gm level vs little money you can make from it, gm from poorer country has big incentive earn extra $).