On u.gg, from Iron-Silver rank they consider AREY to be the BEST Azir rune. So many people in those ranks have played Arey azir that the winrate overtook the more viable options.
Azir Build with Highest Winrate - LoL Runes, Items, and Skill Order
Azir Build - Highest Win Rate Builds, Runes, and Items
GamePOW - Azir Rune Build! <3 THE WHYS: - LETHAL TEMPO Azir loves to auto attack with his soldiers, especially with his most recent changes. With Lethal Tempo you're able to scale
League of Legends S12: Azir Mid Build Guide - Millenium
Understanding League of Legends Data Analytics | by Saar Berkovich | Snipe. gg | Medium
About Azir runes : r/azirmains
League of Legends S12: Azir Mid Build Guide - Millenium