The beat the song is built on is one bar, played through bars 17-20, 31-33 and 35-37, and 7 more places -- 26.4% 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 73 out of 100 -- demanding -- and the thing that decides that is how many notes a second it asks for.
The whole song is 93 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 50 BPM -- and adds the notes back over 5 rungs, each with a tempo to reach and a gate to pass before the next.
Tempo goes 50, 60, 70, 80 and 90 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 one-bar groove on crash, ride, snare and kick, in 4/4 at 90 BPM, counted in thirty-second notes. It is written out above, and it covers 26.4% of the bars the kit plays.
Bars 17-20, 31-33, 35-37 and 39, and 6 more places. The time is kept on the hi-hat to start with, and it changes 10 times over the song.
73 out of 100 on its own -- demanding. The song as a whole is 93 out of 100. Hard, and what makes it hard is how many notes a second it asks for.