I have bought several times from Light Bicycle. They have always been top notch. Response is fast. Product as described.
As long as you buy and deal with Light Bicycle you will get great service.
Aliexpress is crap shoot. I have bought from three different vendors on aliexpress. Two of the where great. One of them ripped me off and sent me the wrong product. The vendor and aliexpress did not refund my money. I don't buy anything on aliexpress now.
As far as your handle bar question there's so many reasons why you might see the same or similar looking handle bar sold by a bad vendor. I can open an aliexpress account; post photos of s-works crux frame but then sell you carbonda cfr696 frameset.