the issue is that things like the DHT and PeX can leak your own home ip address, and local peer discovery can leak the torrents you’re seeding to local network devices.

Mullvad is very privacy oriented, hence it giving this advice.

… And he said it might work on wsl, which is Linux on windows translation layer, including graphics support.

A lot of Linux tooling has opened up to windows users because of it, which would include darling, to run mac apps, via wsl, on windows.