Ok so this also works on skial
When I trigger an SMAC ban on myself, the sourcebans page shows
STEAM_ID_STOP_IGNORING_RETVALS
STEAM_0:0:0
76561197960265728 <---- profile link, but it leads to nothing
Oh, and I can still join their other servers. I believe after a while I can join the one I was banned from.
Admins also try to manually ban me from the server via the Sourcebans page, but it doesn't do crap because I have no steamid in the server!