Even if we ignore the 1-24-5 Xin game, there's still the matter of a 3-14-1 Xin game and a 2-15-3 Nunu game, both of which are back-to-back games with a relatively standard 10-10-11 game between the 3-14-1 and 1-24-5 games.
Going further back in your match history you have two afk Tahm Kench games (both of which were remade because of it) where you have no items and are lv.1 while everyone else is lv.2 or 3. There's another TK game where though you have Corrupting Potion the story is still the same as the two itemless and csless games. There's also the matter of a 1-12-2 TK game as well where the enemy team has a very fed varus, morgana and anivia likely due to the int.feeding.
Conclusion: You're not fooling anyone here as it's clear that you have a history of afking and intentionally feeding. You clearly have allot of experience playing TK (especially in ranked) since he's your main, and at least some with both Nunu and Xin Zhao as both have one game where there's nothing out of the ordinary, though I did notice that in both Nunu games (4-4-22 and 2-15-3 respectively) you ran Smite-Teleport and both were double jungle games with a J4 and Graves jungle respectively, the former of which had an arguably better performance than you did. While I can understand having a bad game here and there there's enough evidence here to prove that you have a long history of poor gameplay behavior, hence the ban. Next time if you're going to lie at least try to make it a convincing one.