Is there not a typo on the installation guide for RPi3 in the wget, and consequently bsdtar, commands? It's
wget http://os.archlinuxarm.org/os/ArchLinux ... est.tar.gz
bsdtar -xpf ArchLinuxARM-rpi-2-latest.tar.gz -C root
But should it not be 'ArchLinuxARM-rpi-3-latest.tar.gz' ?