I don't agree with this. Most of the stud DT in the NFL are 6'4" (besides Aaron Donald who's just an outlying freakozoid). We've even seen dudes like Arik Armstead have much success and he's 6'8".
If they're in the NFL, they play with excellent leverage and pad level- which isn't a given @ the collegiate level. I'm not saying Enyi can't do it; I'm just saying playing with a low center of gravity doesn't come naturally the taller you get.