What really rubs me the wrong way about this article is the way it comes off as her crying wolf. It's bad for the women that actually experience proper sexism that truly limits their potential. The way I read this article is that she had a bad read on how eager her candidate was to accept the position, low-balled him on the offer and he decided he would take a better offer somewhere else. Nothing about that is sexism and yet calling it sexism is hurting the cause.
In other words, if this person had even the slightest possibility of seeing it her way and coming out and apologizing for their actions and learning of their mistake, they certainly won't now. If anything the reaction will be to try to save face by telling everyone that she overreacted and is seeing sexism where there was none, regardless of the truth.
Hopefully we don't get people trying to make it into something it's not (a vendetta)
It's hard to not be ageist, but in this case I think there was some of that "she's half my age so why is she higher ranking than me" involved.
But you're definitely right that there's not much evidence here. I can still make assumptions no matter how much of an ass they make me.