There is a lot more to this. I have ordered numerous components from AliExpress especially during the latest supply channel problems here in the West. Disc brake pads, XTR Disc rotor, 140mm to 160mm Disc adapter, GRX 810 Crankset, pedal cleats, GRX 810 rear derailleur just to list most recent orders. I have originals to compare to and all were authentic. Thing to note, all were OEM parts not in retail packaging.
I also purchased a custom painted Carbonda Gravel frame and the quality as well as the purchase experience was excellent.
The bigger question that I have raised before is why are the Chinese still able to source parts when the rest of the world has major supply issues? Forget the reduced cost and highly subsidized shipping the fact is the only place to get many of these parts and supplies is China.