If this is possible, would a TU who knows how to do this reply to me off-list? It is a matter of privacy, so I don't want a permanent record of my username and what I'm trying to remove left in the maling list.

"In some cases rewriting the history of an AUR repository is required, for

example when a user inadvertently uses their real name in a published commit."

https://wiki.archlinux.org/title/AUR_Trusted_User_guidelines#Rewriting_git_history