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Riot Jag Tweeted the upcoming changes for patch 11.15
11.15 Patch Preview is here!
Lot of pro-facing shakeups for playoffs in here, plus a couple of high performing solo queue champions.
For context: Aurelion Sol's Elite win rate in the last 2 patches has been 57.3% and 57.4%. Both of those have been the highest win rates of any champion in Elite MMR.
He doesn't have the highest "1 trick" rate or comparable metric that would suggest his low play rate is a cause.
Imgur (image) version: https://i.imgur.com/YzMv2Rn.png