I will have to give some of the mainlines some careful reading before I pass judgment, but it doesn't seem very ... complete.

After 1.d4 Nf6 2.c4 e6 3.Nf3 Bb4+ 4.Bd2 a5 5.a3, for example (which may not be the most important line, but is surely worth some attention), The line sort of peters out after 5...Bxd2+ 6.Qxd2, when the only move given any attention is 6...b6. In his Nimzo/Bogo repertoire, Sielecki recommends 6...0-0, which doesn't receive so much as a mention (not even by transposition).

Nor do I see 1.d4 Nf6 2.c4 e6 3.Nf3 Bb4+ 4.Nbd2 d6 (also Sielecki's repertoire) anywhere. Indeed, games I've played previously with the Bogo-Indian run out somewhere between moves 8 and 10. I like the historical introduction, but I don't think there's nearly enough analysis or investigation of variations to call this even "somewhat comprehensive." And the commentary is, in general, quite light.

I'll give it some more concentrated study, but my first impressions are not terribly positive.