Hhhm, that may be true (no yeast in self-raising flour). However, in that case I don't understand the advantage of a non-yeast naan (except for possible flavour differences). I figured it wouldn't use any leavening agents at all. I can see tons of advantages to that (and problems).
For me, the advantage of a yeast-free dough over a yeast-based dough is that one does not have to understand yeast ! Yeast, being a living organism, has a mind of its own (in a metaphorical sense); if it likes the conditions, it will grow, multiply, give off CO
2, cause the dough to rise, and so on; if it doesn't like the conditions, it will just sit there and sulk. Baking powder has none of these foibles : it does what it's told, and that's the end of it. Now I happen to believe that yeast is better, for most home baking, but if Stephen can get a non-yeast-based naan to not only /look/ like the real thing but to taste like one, then he is going to save a great many would-be chefs a great deal of heartache !
Incidentally, as I composed this, a thought came to mind : there is a saying in the equestrian world that you tell a mare what to do, ask a gelding, and discuss it with a stallion; exactly the same is true of baking powder, instant yeast and real yeast, in that order ...
** Phil.