The beat the song is built on is a 2-bar phrase, played through bars 6-8, 10-20 and 50-52, and 5 more places -- 27.7% of every bar the kit plays. That is the spine of it; everything else is what happens around it.
It is played on hi-hat, snare and kick, counted in thirty-second notes. On its own it scores 69 out of 100 -- demanding -- and the thing that decides that is the independence between the hands and the feet.
The whole song is 73 out of 100, so the beat is most of what the song asks for. Get it clean and the rest follows.
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 107 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 107, 126, 145 and 164 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 hi-hat, snare and kick, in 4/4 at 164 BPM, counted in thirty-second notes. It is written out above, and it covers 27.7% of the bars the kit plays.
Bars 6-8, 10-20, 50-52 and 54-60, and 4 more places. The time is kept on the hi-hat to start with, and it changes 20 times over the song.
69 out of 100 on its own -- demanding. The song as a whole is 73 out of 100: demanding, mostly on the independence between the hands and the feet.