With the new style of Gentoo documentation based on MediaWiki the Gentoo Handbook for ARM-Architecture is missing.
Yes, this is done in good faith. The "old" ARM handbook was already marked as outdated and there were no editors/developers willing to update it. As a result, I did not move it anymore.
The trigger to create a new architecture handbook is one that I would expect from the developers that work on that architecture, because all I/we can do is edit on language style and structure, not on content. Moving erroneous instructions to a document as official as the handbook might generate more problems than they would fix.
I'm reassigning this to the ARM team to trigger them. If anything, a short set of installation instructions or resources are best placed on their project page at https://wiki.gentoo.org/wiki/Project:ARM.