Comment by duskwuff
pilot-link was removed from Debian in 2019, as some components of the project depended on Python 2, and the upstream web site disappeared.
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=937292
It looks like there's a fork at https://github.com/desrod/pilot-link, but I don't know how functional that is.
It is functional. Arch's AUR uses it as a source for `pilot-link-git` package[1]; works just fine with jPilot.
[1] https://aur.archlinux.org/packages/pilot-link-git