Well I didn't make the quote
I think that, by definition, any book setting out to describe the preparation of Balti dishes must be a book concerning BIR techniques. The Balti styloe originated in the BIR trade (in the West Midlands, to be precise).
It would be interesting and informative to hear your reply to Pat's opinion that that is not the case. I would suggest that your opinion is, at least, less believable than Pat's on this matter since you seem to believe what you say above.