1.  <https://github.com/shabble/irssi-docs/wiki/liberachat> (clearnet needed)
2.  <https://libera.chat/guides/registration> (clearnet needed)
3.  <https://github.com/shabble/irssi-docs/wiki/liberachat_certfp> (clearnet needed)
4.  <https://irssi.org/documentation/qna/tor/>

Details:
proxychains4 irssi
/server remove irc.libera.chat
/server add -network LiberaChat -tls -tls_cert ~/.irssi/libera.pem palladium.libera.chat 6697
/connect LiberaChat (will now use tor)