The percussion patterns used in this song are basically pattern 34 with the break: that is pattern 40 from tutorial 17. And then there’s the turnaround Pattern 42, also from tutorial 17.
Furthermore in theory they’re all unmutes but in the version 2025–03-21 they didn’t all come out. It’s a matter of skill/preference(/randomness).
H1 means first harmonic (on the twelfth fret). GL!