Ding is in fact the sole player that can make this not statement not true, as he is a candidate with a known positive score against Magnus. A couple WCCs ago Magnus said Ding was the only player that he wasn't sure he could win against -- but that he wouldn't make it, after a poor showing in the candidates at the time.

Anyways, I don't know who would win in a Carlsen - Ding WCC. Nobody does. If the game statistics are to be believed, then Ding would.