ADCs aren't stronger
Sure, Ardent Censer might have broken the meta, but take this item out, and adcs are legit the same as when they were considered weak in early 2017 ''lol adc 2k17 meme''
I also concede that the meta might favor matchups where adcs assume the role of the carry, but that's only because people are actively follow the meta. Break the meta, and suddenly you realize that adcs are just the same as early 2017.
If you take out Ardent Censer, i still kill people just as fast as before with my Tristana, nothing has changed. The stats are the same, the damage is the same, the healthpools are the same. Only people's mentality has changed.
It all has to do with mob mentality. Ardent Censer broke the meta, making adcs effectively stronger for a time, then word to mouth made it's work. Person A tells Person B that adcs are too strong, Person B proceeds to get killed by adc: ''Hey i got killed by Twitch, that's because he's OP! Not because i got outplayed or my positionning was lacking.'' Even after ardent censer got fixed, people are still hard wired with their false ideas.
Eventualy people will just forget about it, in a few weeks or months, when the meta will shift, despite nothing having changed.