I haven't really noticed him being weak aerially. But that could be down to me not really focusing on his aerial game.
But there seems to be a consensus among a group of people that he's weak in the air. And I'm assuming it's likely due to how his aerial game is presented on Fbref. And I'm wandering if it's a case of not knowing the difference between volume and percentage. Because the reason I say that is because if you read the article below (5 months old) it provides stats that show him to be strong aerially.
Front the article linked below: "As for aerial duels, the centre-back contests 2.5 per match with a 71.7% win rate. He has given up two fouls inside the box and averages 0.58 fouls per 90 minutes on the pitch."
https://ligue1analysis.com/jean-cla...23-data-stats-analysis-scout-report/analysis/
But I think personally, I'd rather have a CB who is a little bit weaker in the air but is strong at contesting ground duels and also has the ability under pressure to help progress play. Like the vid below demonstrates, he's very strong in 1v1 situations even against the best attackers in the world but he also provides something a little bit extra in possession. And I think at 23 years of age, he's a low risk signing with potential to grow further with good coaching.