Some of it edit history usernames appears to be bots, they must grab a lot of the info from other sources automatically?
Looking at the edits on that page, one of the 'bots':
This user account is a bot operated by Lightmouse (talk). It is a legitimate alternative account, used to make repetitive automated or semi-automated edits that would be extremely tedious to do manually. The bot is currently inactive but retains the approval of the community.
So some means of automation, but not automatic. The people who do it are no doubt active or expert in their field and just want to share their knowledge. I'm sure some edits are from basement dwellers seeking some sort of validation but you get that on forums too
