Looks like another bike that could be a fuji-ta bike. This one is similar but not identical.
Folding Bike FA170 - Tianjin Fuji-ta Bicycle Co.,Ltd.
They do the same frame designs in both steel and aluminium and can mix and match other parts of the design. If you compare the fuji-ta factory to the Dahon factory the Dahon factory looks incredibly primitive but I think the Dahon factory is merely assembling parts sourced from other Chinese factories. Sadly we don't get the Chinese made Dahons in Europe I think most of ours are outsourced to max.com of bulgaria to manufacture them and not as good. So I wouldn't assume the frame is inferior but clearly component quality is critical and that's always related to price but a direct seller price isn't always comparable to a normal bike that goes through wholesale and retail channels each requiring greater profit than direct sellers.