This is not remotely true, and it sort of gives away an ignorance of either project. (I'm actually fairly ignorant of Hurd myself, but I'm familiar enough with MINIX to know that the comments about it are pretty far off target...)

I also find it odd that you specifically mention MINIX's documentation, because it's arguably the weakest point of the whole project. Even as for the book, if someone thinks they're going to be able to pick up the latest edition of Operating Systems: Design and Implementation in search of documentation for either MINIX-the-project or MINIX-the-software, they will be sorely disappointed. The fact that the book is now about a decade out of date is one reason for the latter. There are a number of reasons for the former.

I've written some (recent) comments that go pretty in-depth on the subject. E.g., https://news.ycombinator.com/item?id=9736214

Again, I can't imagine that anyone with a current, even-cursory-level understanding of MINIX would hold the requisite opinions to make the comments that you've left here.