No, it's definitely not official policy, or unofficial policy even.
What I was getting at is that if Riot came out and outright said "hey, from here on out everything new, reworks, etc. are going to be OP because it's easier to collect data and make more information balance choices" the community would have a shit fit of epic proportions, even though in terms of game health it actually would likely be an improvement.
In other news: Tahm Kench now has 52%+ win rates in top, support, and even jungle with best results skill orders. New jungler for my pool, aww yess fatass catfish coming up!