The beat the song is built on is one bar, played through bars 8-9, 11-12 and 16-18, and 16 more places -- 29.2% 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 62 out of 100 -- a step up -- and the thing that decides that is the speed of the hand keeping time.
The whole song is 90 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 75 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 75, 88, 102 and 115 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 hi-hat, snare and kick, in 4/4 at 115 BPM, counted in thirty-second notes. It is written out above, and it covers 29.2% of the bars the kit plays.
Bars 8-9, 11-12, 16-18 and 20-22, and 15 more places. The time is kept on the silence to start with, and it changes 8 times over the song.
62 out of 100 on its own -- a step up. The song as a whole is 90 out of 100. Hard, and what makes it hard is how much of it falls off the beat.