[Arkshine]

Yes, more or less.

What does AMXX: At player's connection, it checks if there is a valid steamID, if not, it will check each 0.7 seconds until engine returns a valid steamID for the player, then execute the forward.

What does the module: It checks at server frame when steam API notifies engine about a client being approved.

Usually you will have: client_authorized -> Steam_OnValidateClient -> CSteam3Server::OnGSClientApprove -> "Arkshine<2><STEAM_0:0:172726><>" STEAM USERID validated"
If you want to make sure a client is "officially" validated, you should probably use this module forward.