Only the Guinsoo's abusers are doing fine, as well as Draven (who's an insane lane bully), MF (another insane lane bully), Ezreal (who's abusing something rn), Xayah, who's the best ADC into fighters, or Lucian, who's abusing on-hit items.
So... 3 on-hit abusers, two lane bullies, and the only ADC who's ever actually been good against fighters.
Also, lmao, if you actually build crit on any of those 9 champions (except Xayah, maybe), you're trolling. There's just no way around that. Crit is useless as fuck for them. It was made more expensive than Rageblade builds (while Rageblade users tended to have the best scaling of all ADCs, because it was a shittier build path and took longer to come online than Crit), and wasn't actually made better than it.
Also, Guinsoo's+BorK and 2v5ing with Lulu just isn't a thing anymore, unless the entire enemy team is basically AFK. it was never a thing except with Kog'maw, and lmao gl trying to even make it to 15 minutes with Kog on your team in a meta where tanks have basically vanished.
Aaaaand Kai'sa and Ezreal were already top-tier beforehand, and they only dropped to about a 51% winrate (last I've heard, at least). They dropped 3-4% and didn't have a single item of theirs nerfed. While Kai'sa did lose some power in direct nerfs, Ezreal I don't believe was nerfed at all. Lucian only came back into viability because of ER and BorK buffs. Xayah may have shifted away from crit entirely now that ER doesn't use crit. MF was going to do well on the sole fact that Fleet Footwork was nerfed, and it's no surprise Draven came out ahead, because Bloodthirster was nerfed, and because most other marksmen were left in the dust.