How do I Replace PulseAudio with Pipewire on an Artix Install with s6?

It’s telling you there’s something wrong with the type file for that service. What are the contents of the file? Is there a typo?

Coming from Ubuntu I can understand that things will feel unfamiliar on an Arch based distro (especially a non-systemd one), but it’s really important to read and try to understand any error messages you get. I’m honestly not trying to be rude, that message appears to be very straightforward. I suspect that might be why no one has responded yet.

Anyway, that file should just contain a single word to indicate the type, one of “oneshot,” “longrun,” or “bundle.” I would think you want longrun for pipewire.