i figured this out in a few minutes , so it’s not perfect yet . but it’s a good start . . .

he’s got the whole guitar dropped half a step ( so C# , not D like a lotta keller tunes ) .

then the chords are as follows . . . keep in mind they’re all relative to standard tuning ,
while the first chord is played as an F# , it’s actually A G . . . cool? watch the video
he voices a lot of the chords in first position bar for his hammer on stuff

verse
F# – A – B – Esus2
F# – A – B ( crazy trill hammer on thing )

pre chorus is something like
C#m7 – B – A – B

chorus is
F# – A – E
F# – A – B
C#m – A – B
or something like that . sorry this was semi rushed . as i work it out more i’ll post .