There have been endless changes in League of Legends over the past few weeks. One of those being the rework of Tahm Kench, modifying his abilities and making him the best champion in the top lane.
Following the modifications in Patch 11.14, Tahm Kench's win rate rose to 53.16% in ranked matches. Though the champion still doesn't shine as support, he has found his position in the top lane in the support position, he has found a space in the top lane — which was the developers intention after the rework.
Tahm Kench now has a pick ratio of 3.6%, but he is one of the most misaligned characters in League of Legends. A situation that won’t be rectified anytime soon, as the character has been nerfed in Patch 11.15 — which is now available on the PBE server.
Fortunately, the situation is relatively easy to fix - it's just a question of Riot balancing out the numbers to adjust the winrate, rather than having to address Tahm Kench's abilities themselves.