TL;DR
Riot's response yesterday was mostly focused on Azir Irelia having a surprisingly low winrate, and mentioning that they might not nerf it in 2 weeks because of that. My main point here is that this winrate-heavy perspective sort of concerns me, because overpowered and oppressive are two very different things, and a lot of the more "oppressive" decks in the game have actually exhibited the same exact winrate. TF Go Hard was also a ~52% winrate deck that stopped people from being able to play a lot of types of decks on ladder. In fact, in TF Go Hard we saw the same EXACT pattern, which was a winrate trending slowly down over time. The reason for this was the meta was being warped around the deck to the point where TF Go Hard was killing off its own favorable matchups, and I think that's the exact pattern we're seeing with Azir Irelia.
TL;DR TL;DR
The bigger problem is that Azir Irelia is limiting the viability of a lot of decks from the game due to its polarized matchups, rather than its raw winrate.