If you want an Arch-based gaming distro there is Garuda (also a non heavily-themed version). I used Garuda before switching to plain Arch. It ran pretty well and I really liked the btrfs filesystem and the snapshots. It meant I could easily restore a backup of my system if I manage to break it. Which I did a few times.
What’s wrong with just plain Arch? It works well enough for my desktop and for Valve to build SteamOS. When gaming having the latest packages are a huge advantage.
Unfortunately I can not watch the video right now
Edit: So he just made an atomic openSUSE distro for handhelds. I like that it has BTRFS snapshots, I use it on my desktop as well. Nice for people that prefer openSUSE I guess but I will stick to Arch.