I think this is the website for the brand
http://vintageguitarsus.com/
I agree with Howard and think the sound of the guitar fits his voice. Also, in interviews some of his favorite music is old blues and he loves that sound so fret buzz makes sense in light of that.
I really enjoy his music and think his song "The Devil Wears a Suit and Tie" is one of my favorites of his!
As to being Canadian, I do not see how that has any bearing on what type of music you should or should not sing?