That makes sense in a way, but I would disagree for several reasons
1) J-35 is not like L-15. This will be a very radical departure for UAE, very radical. Systems, philosophies, weapons, not to speak of integrating into their set up which is almost 100% western. They would be buying a plane unable to fit into their systems
2) US would go ape, and it seems like a strange move considering the lengths the UAE is going to in order to ingratiate themselves with Trump
3) China has been very supportive of Iran diplomatically. China will always act in its self interest but it is utterly bizarre a few weeks after UAE ws bombing Iran China would then provide a stealth strike fighter to UAE
4) UAE is literally in the middle of inducting 80 Rafales, inducting thhe J-35 at the same time may not be physically impossible, but given their manpower I would say it would needlessly stretch them
For the above reasons I would find it very difficult to think it would be the UAE.