Did you read the next two sentences? There he not too subtly implies that any one who criticizes her delay in announcing is calling her a “diva” or a “tease.” Worse, the next sentence implies that any critical comments of her are attacks on Conservatives and the eventual nominee.
In it he explains how the new Palin meme started, how the MSM ran with it, and how it's become the normal MSM method for taking down any effective conservative. It was a powerful piece, and will help to explain why he is making that jump.
It was so powerful that Rush Limbaugh read it on the air for his opening monologue the next day.
He's not saying it's "any" critical comments, it's the personal invective and the cattiness of the examples in his article.
I hope that helps.