Surely. Every single yuan spent on construction -- whether what is being built is useful or not -- gets added to GDP; so, if one takes all the spending in Ordos and divides it by its near-zero population, the number is surely impressive.
The same logic applies to the entire country's GDP, BTW: take out spending on construction, and China's GDP growth looks a lot less impressive.
Ordos City itself apparently has close to 2 million people, but there's a fully developed urban housing district designed for 300,000 which has only reached 10% occupancy since 2010.
Oops, I meant to write, "if one takes all the spending in the ghost city of Ordos and divides it by its near-zero population, the number is surely impressive." The point I was trying to make wasn't about the overall Ordos area, just about its ghost city.
Did you know Ordos has higher GDP per captica than HongKong?