The beat the song is built on is a 2-bar phrase, played through bars 1-3, 5-7 and 9-11, and 13 more places -- 30.5% of every bar the kit plays. That is the spine of it; everything else is what happens around it.
It is played on crash, ride, snare and kick, counted in thirty-second notes. On its own it scores 51 out of 100 -- a step up -- and the thing that decides that is how fine the subdivision is.
The whole song is 70 out of 100, so the beat is not the hard part: what costs you is everything around it, the joins and the fills.
A part this hard is not learned by playing it slowly and hoping. The room opens it on its simplest reduction -- the timekeeper alone, at 90 BPM -- and adds the notes back over 4 rungs, each with a tempo to reach and a gate to pass before the next.
Tempo goes 90, 107, 123 and 139 BPM, and the gate at each one is 8 loops in a row with no wrong note and no wobble in the time.
PRACTISE THIS BEAT →A 2-bar phrase on crash, ride, snare and kick, in 3/4 at 139 BPM, counted in thirty-second notes. It is written out above, and it covers 30.5% of the bars the kit plays.
Bars 1-3, 5-7, 9-11 and 13-15, and 12 more places. The time is kept on the ride to start with, and it changes 5 times over the song.
51 out of 100 on its own -- a step up. The song as a whole is 70 out of 100: demanding, mostly on the independence between the hands and the feet.