Well. Your alt account was auto-banned by my system(quite some time ago). Thus the ban carried over to your main account when you attempted to rejoin a few months later.
It only triggers when you actually have said DLL injected.
Quote:04/30/16 02:49:05
IP:72.**.***.** |Name:'swag'|ID:STEAM_0:0:59915803| has scripthook injected..
http://steamcommunity.com/id/xbeastguyx/
It only triggers when you actually have said DLL injected.