That's an unfair criticism. The author (and I, and the rest of us) are not focussing our efforts logically. We can see browser stats in server logs, but measuring disabled or impaired visitors' traffic is easy to overlook - servers don't collect this data point.
She's now raised the issue for a wider audience and this could only be hypocrisy if she held herself up as an example of how to do things correctly. She isn't, and says so right at the top of the article.
