well it is deceptive, in part cuz of how he's built, he's got really long legs. part of it is just raw explosion and acceleration tho, it's something i'd imagine scouts would say 'flashes'
He's pretty much got his own crossover move that he uses too, u don't really see it done exactly like that by other players.. and part of that relies on deception he kinda makes it like he's scanning the floor, or gonna pull back or up and then boom he's a full stride past the defender moving at high speed. he'll also break this out when he's moving high-speeds approacing the 3pt line everyonce in a while, thats the best variation of it.
https://www.youtube.com/watch?v=KBGYmuiWQ0I you can find him doing this exact move in HS.. I located and posted the footage that summer of the draft.
his go-to move you see him use more often is this in-and-out dribble, something that CP3's perfected over the years, Dante uses it really well he gets low and he does it fast and sets it up quickly.. He tortured OKC with this move the other night it's how he scored 22.. You'll see him crush Kanter with it, Sabonis, Abrines --- and he's beating em not just by a step, he's getting a step and a half.
https://www.youtube.com/watch?v=w3e-NKEp5mw
A part of Exum 'getting it' is he tries to beat his defender right away, and not just beat you slightly, he's trying to get you to lean forward or on your heels or to the wrong side to set you up or lull you into the blow-by, like what smaller guards need to do.