Is that date a typo? Should it be September 11th, or is that saying August 11th for next year?
Also, the reason I stopped using the built-in match history page is because it stopped working years ago. It then took long enough to fix that I (and my friends) got used to using op.gg instead. Just like Dominion and Twisted Treeline, this seems like it's just being removed because Riot neglected it to the point that it can't be salvaged easily. I really don't like that everything is being moved to third-party tools, but I guess I see the reasoning when there's good drop-in replacements.