Eschwartz [1] filed a request to merge nvidia-docker2 [2] into nvidia- docker [3]:

"the new version 2" packages aren't really how we do things, the original package should be updated and if necessary, -legacy or slot packages could be created for people who still want the old version.

[1] https://aur.archlinux.org/account/Eschwartz/ [2] https://aur.archlinux.org/pkgbase/nvidia-docker2/ [3] https://aur.archlinux.org/pkgbase/nvidia-docker/