Here's the thing--
Talon's nerf revolved around his Rake spamming.
It was easy, cheap harassment, that was difficult to dodge.
Now Zed has easy cheap harassment, but it is reasonably easier to dodge.
Hence not as much of an issue.
Why did Talon fade fast? Because without that cheap harass and farming giving him lane control, he's quite bad.
Talon needs a big gold advantage to do much, especially against the bruisers he tends to face top lane.
Without the ranged harassment and waveclearing giving him that gold, he becomes supremely ineffective.
Zed, even if they nerf him, will still be able to farm and poke near-infinitely from range due to using Energy.