The majority of people do not play videogames. The majority of those do not play any roguelikes. Citing the majority is completely useless.
Furthermore I'm not convinced you can make a tutorial for Dwarf Fortress. There's too much complexity, too many edge-cases that you end up needing to know. Most people seem to burn out if fed too much info at once.
> I’m convinced from articles about dwarf fortress that it’s a game that few actually play and enjoy, but like talking about as if it’s fun.
On my Steam friends-list I have 14 friends who have purchased the game. The top three by play-time are at 314, 267, and 67 hours. The remaining 7 with playtime average 22 hours, the other 5 have it in their backlog. That to me is some excellent playtime. Not Lethal Company numbers or anything, but that game didn't have a release before steam either.