This aircraft has been under development for several yrs. Earlier mock-ups, models and artist impressions featured higher BPR engines.
It seems the Chinese decided they couldn't wait for the right engine and moved ahead with a proven one. They'll continue flight and system testing, taking a hit on range on the initial aircraft.
Looking at the current PLA size and territory they have a pathetic small transport fleet. No doubt the Chinese want several hundred of these (& Y-9) ASAP, so probably little export ambitions.