They raced against each other December 2021. Wout trashed him in a tractor pull mud race and the next race MvdP pulled out (DNF'd) because he saw he wasn't fit enough to fight for the win. He hasn't raced CX since.
For someone with a "sore" back to choose a muddy grinder as his first race back shows MvdP isn't the sharpest tool in the shed. He doesn't make the best decisions and it's hurting him now in life and cycling.
I think it's hubris getting to him, that has cost him the race (or worse) on many an occasion. He doesn't strike me as a dimwit per se. But it's also the same hubris that has netted him some of his most stunning wins. His attack in the TDF in the penultimate lap, which earned him yellow. His win at Amstel, he attacked way too far out, got caught and got dropped because of that. But due to Alaphilippe and Fuglsang having a romantic moment, he was able to take the win with a 1km sprint. His win in the Tirreno, thinking he was Cancellara or Evenepoel, only to win with mere seconds ahead of Pogacar, losing a 4 minute lead. Same with his solo victory in the Benelux Tour, going far too early, only being able to hold of the chasers by a few seconds.
I think that's what i like most about him, he isn't afraid to try. Sometimes that results in him running into a wall, other times you get great entertainment and tense victories.