I am honestly a bit puzzled by this description and I wish they had named the publisher. I'm fairly familiar with this space and the usual experience with tech publishers is that they don't get all that invested in what they publish because 99% of technical books sell somewhere between 500-5,000 copies. That's barely enough to pay the copyeditor to do the bare minimum (often paying attention only for the first couple of chapters), then pay the layout guy, then the proofreader.

The usual accounts I've heard from my friends who published with Wiley, Addison-Wesley, or O'Reilly is that they sign up, get some in-depth feedback on the first couple of chapters, and then are on their own. I've never heard of a tech publisher exercising this level of creative control. I don't doubt that this happened, but it just sounds out of the ordinary.

The 500 - 5000 figure, which is correct, is why most folks should instead self publish via KDP. 70% royalties mean you can get 10-50k easily with an average book. If the book is a success, you can switch career to a full time author if you wish. All this with full creative freedom. Many years ago, I canceled my Redis book for a large publisher for similar reasons to the OP: too many "do it this way" requests.

> I am honestly a bit puzzled by this description and I wish they had named the publisher.

Does it matter which exact one if all the publisher oligarchs behave exactly the same?