nothing else matters, not what happened in any other game, pre or post, the simple fact that this was listed in the pre-game logs(where as other games didn't have any pre-game listed) shows you their trash system decided it needed to add it.
Hate to break it to you, but, we (the playerbase) don't actually have all the details on the pre-/post-game chats in reform cards. We don't know if they always show the pre-/post-game chats, or only if they show something offensive, so, throwing a fuss over something we don't fully know about yet gets you nowhere.
Besides, if you really are concerned as to why that game's log showed pre-game chat... Ask, rather than act like Riot is a pathetic, scummy company that will ban you for little to no reason when we already know you've got three games worth of reason to be banned?
Because asking politely goes a long way, in comparison to throwing around insults, accusations, and so on.
Their entire system is garbage, and whoever wrote it is a tremendously awful developer...
It isn't, and they aren't. Again, do you really think you'll get an answer by being belligerent and spewing insults like you're bent over a barrel?
This is coming from a real dev who knows what they're talking about.
Throwing around insults and acting like those two lines are the sole and exclusive reason you got banned tells me otherwise.