If this happens again (which is very likely, I fear):
I've been downloading videos with
https://flathub.org/apps/org.nickvision.tubeconverter (yt-dlp gui)
and watching them with mpv. Still looking for a Tube-Archivist/Pinchflat stlye app that doesn't download the whole channel (or makes me paste single URLs) but has a nice Freetube-like interface for downloading and watching offline ...
+1 for Bazzite. Atomic distro + NVDIA drivers included π