you must be a medical practitioner! he has been established as an unintelligent character from the start. raws have also shown his childhood so it explained his outlook on romance.
inserting neurodivergence willy nilly is harmful and is largely the reason why at the smallest inconvenience, many self diagnose. people can be stupid without displaying a medical disorder.
I'm re-reading tis,I kinda take back my words , I'd argue that he might be the most detailed character I've seen from the way he holds chopsticks, his thinking / behaviour, not knowing basic commonsense but still just enough to get by , there's no way he doesn't got some kinda syndrome . Looking at all the other characters, the author definitely knows how to write , there's no way they would just slap a dumb guy role on the bottom

The way he acts is very similar to a neurodivergent person, he clearly has issues with relating to other persons feeling while himself being completely empty brained