It's not difficult to guess it was not Dakar or Chile :) It was specially made kinda..clear in video, no? It takes a bit longer than helicopter ride to get to Brazil or Chile...
There is no doubt with this kind of riding they did have constant tech support on the ground etc.
But even if they used 4 bikes - ones in at least 90% of shots where you can make it out are same two by looks of it. Perhaps they messed up 2 first, then used 2 spare to make clean shots. I wonder how many riders they used :)
For me it was more about bikes reaction to that kind of terrain and speeds. Kinda surprisingly composed. I guess many other bikes would look same good in similar video.
One thing they failed to do - to properly promote their gear...despite that was objective