This frame is sold for over 1000 Chinese yuan in China, and of course, it includes free shipping within China.
The quality of the frame should be fine, as many people in China are riding this model of frame.
The frame is manufactured by Kangpeng Bicycle, which is the OEM factory for the Poseidon bike's gravel frame (Redwood).
However, I honestly don't think it's worth spending so much money to buy this frame.