It's an interesting list. I'll give them credit -- it includes a lot of really good guitarists who don't normally pop up on something like this, and it doesn't just give us the rote top 10 we've been force-fed since the 70s. Mdou Moctor and Ali Farka Touré are both brilliant and I didn't expect to see them here. (It filled my heart with glee to see Clapton at 35. I think he's wildly overrated, but it's somehow become unthinkable to leave him out of a top 5.)
Putting Joni Mitchell 9th is pretty ballsy. Don't know that I agree, but I suspect that's one that makes more sense if you can play, which I can't.
One immediate observation I had: if Paul Simon is on your list of greatest guitarists, the list is probably longer than it needs to be.
Several of my favorites made the list -- Johnny Marr, Peter Buck and Bob Mould. I think Jerry Harrison of Talking Heads and Will Sergeant of Echo and the Bunnymen should be on the list, and I'm really surprised Mark Speer of Khruangbin isn't on there -- I think he's brilliant. But whatever.