I really don't know who's that account. I analyzed his steam profile but it said he/she hasn't set up his/her steam community profile. It also can be another instance of a computer connected to the network, I'm currently connected to when playing tf2.

User name: snavellet What is your type of punishment? Ban Where were you banned from? Servers What is your SteamID? STEAM_0:1:159310329 Who has punished you? CONSOLE Why were you punished? I got banned for [SourceSleuth] Duplicate account, I don't even understand why I got banned...