Everyone can vote whatever they want there, I don't find that reliable. I have seen him and he's too laid back to be INFJ, always cracking some jokes or making oscure refernces to various artists he like, that's a lot of Ne.
He doesn't seem to use too much Fe, but he makes full use of Fi: the way the describes himself, the lyrics he writes, his dedication to be as authentic and true to himself as possible etc.
He also tends to talk a lot about his memories and significant moments. The music is also very melancholic, it gives some Si vibes. In almost every interview he talks about something from his past, but it's more like story telling than a proper image of what was there.
My guess is INFP