Tukaani website states "jiatan" as the nickname of the malicious code committer on Libera Chat.
WHOWAS jiatan provided me the following information:
jiatan ~jiatan 185.128.24.163 * :Jia Tan jiatan 185.128.24.163 :actually using host jiatan jiatan :was logged in as jiatan tungsten.libera.chat :Fri Mar 14:47:40 2024
WHOIS yields nothing, the user is not present on the network at the moment.
Given that 185.128.24.163 is covered with a range-block on the English Wikipedia, it appears this is a proxy.