It was never really explained in the old timeline. Perhaps he simply had metahuman abilities to begin with.

Kabal just has the weirdest fuckin' moves.

We still don't know how he summons the ground saw.

Hell, he could make people belly-flop into himself with telekinesis or magnetism or something in Deception, remember that? I can't even begin to explain why, if you had that power, you'd use it to smash people into yourself and knock yourself over like an idiot.

"Cocaine"

True. Lol Looking the way he does, some coke could have infuenced his super speed. Anything can happen in video games cliché.