Hish-Qu-Ten Predator does not beat Ninjutsu Scorpion. Actually, I think it's one of his better match-ups.
Predator's D4 has a very questionable cancel advantage. All follow-ups can be interrupted unless Predator is crazy enough to cancel D4 into the EX Scimitar Lunge, which he generally will not do when he prefers his lasers.
Unlike most characters, Scorpion can command respect from Predator while the disc is in play solely because of his teleport. If in B2 range, the disc becomes even more risky for Predator to use. You cannot punish the disc reactively, but you check him for it which is more than enough to give you a chance at seizing control of the match.
Unlike most characters, Hish-Qu-Ten's armor can only absorb one hit. Score a knockdown and you're free to do as you please. In the neutral, D4 has considerable range, but your F2 and B2 are just as solid.
The only troublesome part of this match-up is when you are forced to take the run cancel pressure, as Scorpion shares Predator's weakness of a bad reversal game.