Yeah I thought that was the single warhead variety. It does carry 4. Which means it can only hit 4 times, not more like in the video.
The R-26 Rubezh ICBM may have been limited to 4 independent warheads but Russia is on an active war footing for nearly a decade now. I am certain that Russia’s weapons development is moving at breakneck speed. Russia has many fine engineers that can do far more with less money to equal the speed of bloated western defense contractors, SpaceX being the notable exception due to being a visionary.