The editor history suggests it's Matt Johnson who normally does the updates, possibly automatically though that is not obvious.
Yes, I've been doing them since 2015g with some C# code I wrote. It pulls down the existing Wikipedia page, extracts all the commentary, hyperlinks, etc. Then regenerates the list using the latest tzdb, preserving the things it extracted. I then diff the old and new content manually, clean up any discrepancies or noise, and then paste it manually back to Wikipedia. I haven't open-sourced this particular bit of code, because of the manual steps, and that it was written somewhat hastily. I probably should clean it up and make it publicly available, or re-write it into whatever automation Wikipedia normally uses. I'm really not sure who made the original automation, but they let it go stale and stopped running it, so I stepped in. I'm open to suggestions if anyone has any. -Matt