You have said that at least 10 times in this thread. No need to keep repeating it. Everyone has already told you it started for them after 11. You are the only one that keeps saying before 11, and your links were not the same issue.
https://www.reddit.com/r/ios/comments/4cayqi/ios_93_rapid_battery_drain_when_watching_youtube/
It's been a long standing issue. People have experienced this problem prior to iOS11. Google has not confirmed that it's an iOS11 issue.