Is he really, though?
Didn't he produces most of his points off the man-advantage, where he's pretty much fed his passes to Marner and Dvorak for the "give me" assists? You also can't ignore that he plays for one of the top offensive team, in all of major juniors and played in a stacked Finnish World Junior team, with Aho, Puljujarvvi, and Laine.
I honestly don't really see his offensive ceiling that high, for the reasons above. He'd be a great defensemen, don't get me wrong, but I think his productions will top-up at 40 points. Similar to Hamhuis' production, which I see a lot of in Juolevi's game. Safe, smart, great first pass, not overly physical, nothing to fancy.