Exclusivity deals between a park & ride manufacturer are a thing that can happen (ex. If Cedar Point put in a 500ft spike, they could "buy" a guarantee that Zamperla wouldn't retrofit Kingda Ka and reset the height record until [X] amount of years later) at the right price; probably an insane amount of money, as the mfr would be prevented from a double-digit million-dollar sale. No idea if CP/Zamp and SFQ/Intamin would all agree on something like that, but I'd doubt it.
As for Qiddiya specifically, I don't see a reason anyone there would've been worried that TT2 would break any real meaningful record. Even if they did break 500' on it, Qiddiya would have the record right back within a year.