Well, a lot of DHGate is a lie, plain and simple. They often advertise to be well known factory watches such as noob in their pictures. But, they arnt from that factory.
On DHGate most 2824's are a2824. Or Asian 2824. So a clone of a swiss movement.
Rolex clone movement would be appropiate for the Rolex. For example, Rolex 126334 on DHGate is normally Asian 2824. So not swiss.
Or you have VSF 126334, which has a clone 3235 which takes Gen Parts. Longer power reserve, due to correct movement fits in case better, etc.
A recent thread about an Air King was posted with a $100 Air King. A couple users posted the several differences vs Gen. The consensus was that the Rep was not good.
All in all, you are not getting a watch on DHGate that will come close to Gen. It may pass for those severely unfamiliar with the watch. In person they often look and feel cheap.
If you only care about movement, some TDs will install a swiss 2824 for an extra fee. Others test the watch before they ship it to make sure it runs correctly. All TDs do quality control and send you pictures or video to confirm it looks right.
With DHGate, to my knowledge, you get what you get. No real quality control.