It's not normally permitted to have more than one account.
Rating
Your right he has two active accounts, perhaps chess.com gave him special exemption or overlooked matter. You would have to contact site directly.
To contact the site support team https://support.chess.com/
Dear admins,
In the follow match:
https://www.chess.com/club/matches/1038052/games
I get from a player (ed1975) the question about the player johnkuhles2 who has a other rating on the page i mention above then in the games self. My question is how can this player have 1200 in the matchlist and 800 by the games self. Is it also permitted to have more then one account?
Thank you if you give an answer.
Your sincerely,
Rickhjh