I don't have an opinion on Model G.
I thought the descriptions for the 16 main types in Gulenko's books were comparable with Filatova's, possibly better due to being longer and more detailed, while Filatova's book was a little MBTI-like in places (but not a fundamental problem).
Naturally, if you think the DNCH subtype system is like astrology, you will only think that the whole of Gulenko's book is confusing and problematic due to the danger of it giving noobs a misleading view of Socionics.
I can only say what I said before: that I thought the DCNH subtypes in the book gave an added flavour and range to each type.