Nicotine+ is a FOSS multi-platform gui for Soulseek and runs on Linux, *BSD, macOS, and Windows.
Freyr is a CLI tool that can either built manually for Linux I believe or ran in Docker on Linux, macOS, and Windows.
yt-dlp is a CLI tool that has compiled binaries or can be installed through a package manager on Linux, BSD, macOS, and Windows.
They’re probably referring to nyaa si which normally has either decent webrips, Bluray rips once the show is released physically, and at times with list 3840p shows.
Comments section is kind of more to do with the specific torrent though.