The book is the book. What folks say in marketing materials is irrelevant.Just picking up what Perkins has laid down over the years: he likes to point out how modular tge 5E campaigns are, and they really are when you look at them. Each campaign is built as a series of independent pieces that is easy to repurpise. Nit even "with experience," the modular nature is pretty plain. As far as SKY, check out Appendix A.
These aren't Paizo style strong "Adventure Paths", they are bundled individual modules that have a throuoghline that can be used or ignored. And this is not an unusual experience with the modern big campaign books.
Send, look, all I said was: just make the toolkit without the module pretense. Dragon Heist, as an example, would have been a phenomenal product if not for the terrible adventure.