The beat the song is built on is a 2-bar phrase, played through bars 27, 29 and 31, and 6 more places -- 25.4% 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 sixteenth notes. On its own it scores 46 out of 100 -- a step up -- and the thing that decides that is the independence between the hands and the feet.
The whole song is 77 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 139 BPM -- and adds the notes back over 3 rungs, each with a tempo to reach and a gate to pass before the next.
Tempo goes 139, 162 and 185 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 4/4 at 185 BPM, counted in sixteenth notes. It is written out above, and it covers 25.4% of the bars the kit plays.
Bars 27, 29, 31 and 33, and 5 more places. The time is kept on the silence to start with, and it changes 10 times over the song.
46 out of 100 on its own -- a step up. The song as a whole is 77 out of 100: demanding, mostly on the independence between the hands and the feet.