Link to the Russian vid on youtube
There is nothing here actually indicating an S-400 installation, but maybe your eyes are sharper. The guy over at Foxtrot Alpha has doubts also.
You are correct, at 0.28, 0.38, and 0.53 the radars are not S-400 systems.
It is true that the Russians post only what they want the rest of the world to see, but, ...
Rope-a-dope?