As you can see here viewtopic.php?f=104&t=133 he is under the "server owner" list. I’m guessing his tag was changed to reflect he is not actually the owner of the server, he just has the same powers as the owner.
Mhm. Glad for that, it causes tons of confusion when he is a "server owner" since you would think there might only be one... They have pretty much all the same powers, but being a "server owner" doesn't make sense and causes unnecessary confusion, so he is a "server admin" now.