Modern Front-End Development for Rails B7: bin/setup (page xv)

I’m staggered bewildered how I don’t see anything about the fact that on page 32 it states The code uses Ruby version 2.7.2 yet all the Gem files in the latest download state Ruby 3.0.0.
nrclient-code.zip as of today (SHA265 9739e689b3f94a927e7074f9d311d6b7e067ad773826cd42689c67a14c88956d) has no main directory and bin/setup throws "rbenv" version '3.0.0' is not installed. Can we not get this into Github and iterate faster? Dying to get into this book.