This guy's interactions seem weird but it might just be because of the non-native english or a strange attitude, or he's very good at covering his track e.g. found a cpython issue where he got reprimanded for serially opening issues:
https://github.com/python/cpython/issues/115195#issuecomment...But clicking around he seems to mostly be interacting with interest around these bits e.g. https://github.com/python/cpython/issues/95341#issuecomment-... or pinging the entire python team to link to the PR... of a core python developer: https://github.com/python/cpython/issues/95341#issuecomment-...
If I saw that on a $dayjob project I'd pit him as an innocuous pain in the ass (overly excited, noisy, dickriding).
Here's a PR from 2020 where he recommends / requests the addition of SCRAM to an SMTP client: https://github.com/marlam/msmtp/issues/36 which is basically the same thing as the PR you found. The linked documents seem genuine, and SCRAM is an actual challenge/response authentication method for a variety of protocols (in this case mostly SMTP, IMAP, and XMPP): https://en.wikipedia.org/wiki/Salted_Challenge_Response_Auth...
Although, and that's a bit creepy, he shows up in the edition history for the SCRAM page, the edit mostly seem innocent though he does plug his "state of play" github repository.
