Nobody is doubting Chinese Ability to Produce anything, it was the reliability that people are curious about, and it wasn't just about China, people doubt reliability of the big 3 (CFM, P&W and Rolls Royce) all the time.
No one, I repeat, NO ONE, can build a foolproof Engine, My brother used to tell me this (He is an Engine Specialist on R&R Trent engine for Boeing) The only way to make an engine reliable is with somebody dies in it.
You can simulate any condition on the ground, wind tunnel, but up in the air in 30,000 ft, it is something of another league. You can build whatever engine you want, but the only way to test them for their reliability is when you put it in an aircraft and start making runs at it. Effectively all Commercial Airline Pilot is also a Test Pilot, and there are no way you can know if there are any problem with your engine until it happened when it was running and flying in the skies.
Cargo Door Problem on a Boeing 747 claim 9 lives (United Airlines Flight 811)
Stabiliser Hydraulic System problem claim 520 lives (Japan Airlines Flight 123)
Rudder Hardover Problem claim 157 Lives (United Airlines Flight 585, USAir Flight 427)
Another Cargo Door Design Problem on DC-10 claims 346 Lives (Turkish Air Flight 981)
Engine Failure (Flame Out due to excessive water ingestion) Claim 72 Lives (Southern Airways Flight 242)
and so on...
I for one actually advocating the big 3 to hand over data to new Aircraft and Engine design company so people won't have to die from previous mistake, but i know this is not gonna happen even as i type it. And if this happened to big 3 company, this will certainly happen to Chinese Designer.
If you still think Chinese Engine can be failure proof and will be reliable once they roll off their assembly line, then either you are too optimistic or you may need to rethink again, thanks to the previous accident, I don't foresee Chinese Engine will lose as much as they used to do that in the West before (Hence saving about 1000 lives or so mentioned above) But you would only be fooling yourselves if you think Chinese Engine, or any Engine, (British, or American) are reliable, without considerable people dying in it.