I have no idea if that was true 20 years ago, but it's not true now. XMPP doesn't have this problem; your host instance knows your IP but you can connect via Tor.
Tor has the problem that you frequently don't know who's running all the nodes in the network. For a while the FBI was running Tor exit nodes in an attempt to see who messages were being sent to. maybe they still are.
Tor has the problem that you frequently don't know who's running all the nodes in the network. For a while the FBI was running Tor exit nodes in an attempt to see who messages were being sent to. maybe they still are.