In answer to your "not sure why any of this is on here?" question:
I had all of that installation stuff on here to help a brand new Arch & relatively inexperienced Linux user come to grips with Arch that bit quicker & easier. It was intended to be for them a minor adjunct to the Beginner's Guide.
Anyway, it doesn't bother me that it is not there. I'll never know if it made any difference for anyone who used it or not.