Most can bind it an IP even if they don't bind to an interface. I use rtorrent and airvpn/wireguard. Wireguard uses a static IP address for the client and rtorrent can bind to that IP. If the VPN goes down (which is very rare in my experience) rtorrent stays running but it won't work on any other IP address.
It sounds like a lie to me. Everyone knows there are no good parts of JavaScript.