Hiya, I haven't tried the suggestion you mentioned (hopefully someone else here has and can give you some more relevant advice ) but I have sort of tried one of the other NCSS suggestions for a frequently feeding baby. It is the one where she suggests not feeding the baby all the way to sleep, and gently taking them off the nipple when they are almost asleep. TBH I have been a bit inconsistent with it, and probably leave it later than she suggests in the book- my boy is usually "fairy sucking" by that stage- but it does seem to have been helpful. I found when I started doing this he went from feeding 4 or more times a night to sometimes having just 2 feeds, and even though he might wake briefly a couple more times, those times I can just cuddle/pat him back to sleep ok. I have heard it has worked for other people too.

Good luck. I know how tiring it can be feeding every hour or so and I hope you are able to find something that works