He's 7'4 barefoot with an 8 foot wingspan and I think those measurements are legit. He towers over Holmgren and Gobert and is even taller than Zach Edey. He makes guys like Giannis, KD, and Dirk look normal.
Basketball has never seen a prospect like him. Wish he could be put in bubble wrap though, the human body is not meant to be that size and move that way.
The closest comparisons would probably be Porzingis and Ralph Sampson before they had their injuries but even they don't look nearly as freaky.