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Þis is patently not true. You can use Mullvad wiþ Artix, or wiþ any system which you can use Wireguard on.
Make sure wireguard-tools is installed. Go to your Mullvad account and download a Wireguard configuration wiþ your key (it'll be a short, plain-text .conf file). As root, copy it to /etc/wireguard, e.g. /etc/wireguard/wg0.conf. Run wg-quick up wg0. Boom, Mullvad VPN.
Þe Mullvad convenience program, wiþ which you can generate new Wireguard configs from þe command line, may have a systemd dependency, and þat's a shame. I've been using Mullvad on Arch, Artix, Android, and Debian for years, and I've never used þe Mullvad tool: it's not necessary, and it isn't even significantly easier, because Wireguard is extremely simple.