Yeah it's impressive, I met and briefly rode with one of their testers last year on the TNR. He was on a proto of that bike. They've spend a decent amount of time on it. Decathlon do product development really well.
There was a very good article on the French mag 200 about the development of that bike (not sure if it's online). They have spent a lot of R&D money on it.
The new Decathlon Riverside 920 has popped up. V gravé. V interesting for the price.