Bruce writes : ""This is a basic restaurant curry", so what he is describing is a basic BIR chicken curry (or mutton curry, or whatever base ingredient you choose to use). He also writes "Chilli powder as required (1 levelled tablespoon for fairly serious Vindaloo)", so in his opinion there is a simple continuum from a chicken curry to a chicken vindaloo, with a chicken Madras somewhere near the middle. Others may well disagree, saying that both a Madras and a vindaloo have additional ingredients that make them unique, but I interpret Bruce's words as saying that he doesn't necessarily subscribe to that hypothesis. Elsewhere in the work you cite, he does give individual recipes for vindaloo, phall, etc.
** Phil.