Exaggerated pitch correction like that sounds very different from a vocoder (at least any vocoder I've ever heard). I'm sure there are ways to get close to that sound using a vocoder and other tools if you really try to replicate it, but there's a reason pretty much everyone thought they used Auto-Tune even though vocoders had been around for a long time and they claimed to have used vocoders. And as it turns out, it was Auto-Tune.

And I'd argue the reason why she thinks she changed music forever (God I hope it's not forever) is because of how widespread that kind of use of exaggerated pitch correction has become. Not that it in itself was a completely new and different thing that was completely unlike anything anyone had ever heard ever and music is now played backwards with no notes.