I’ll also disagree with this description, but I do think the guide is quite user hostile. It front loads a bunch of heavy stuff and puts the immediately useful stuff at the back. The sections need to be completely reversed. But it does include a lot of useful stuff for adventure building (when you find it).
I think a book that is very helpful to new DMs is Xanathars, its encounter tables are very quick and easy, and its monster + environment tables are also super useful.
This is a much more accurate description, I agree.