If you look at their contact page they give you the complete address which according to Google puts them definitely in India. I see they also repair watches with very interesting prices. I'm assuming the cost of living in India must be insanely low and hourly wages equally low.
Donor "Tongji" movements are relatively easy to find, and since they are "standard", most parts are interchangeable, with the possible exception of the modified parts used to add that oscillating hand.
The parts are often, even interchangeable between the automatic and manual wind versions. Furthermore, this movement is still in production in various forms, and at various facilities in China even to this day.