If Robinson does win it would be because Stein came off across as too liberal for the state. Someone like Roy Cooper or possibly Jeff Jackson would have much better odds of winning this race.
Stein isn't Squad style progressive though, more like a standard liberal. I always find it quite funny candidates like Stein are portrayed as "too liberal for a swing state" by Republican operatives and the media, while far-right conspiracy nuts like Robinson aren't considered "too conservative/right-wing for a swing state". You basically never hear this, at least not outside Democratic bastions like California or Maryland. Stein is much closer to the center than Robinson. If indeed he was a Democratic equivalent of his opponent, he'd be to the left Bernie.