It’s nightly and not yet officially released. Chances are that it doesn’t work. There is also a chance it might work on a nightly installation, though I doubt it. There is currently no documentation on this for 3.11. Thus it’s not surprising that there are still some docs which don’t cover the puppet module extraction properly. I’d say, they haven’t been touched for a while.
A while ago I have posted a tutorial how to install a proxy without content. However, I only use it to install a proxy with puppetserver. At that time it worked and through many updates it still works. But I haven’t looked at it to do a fresh installation with a current 4.13. But obviously, there is a huge difference between my tutorial and the nightly docs.