He didn't misrepresent or disagree with the author. He added extra commentary on something the author brought up.
And you don’t necessarily have to read the article before comments. I often don’t! But when I encounter something in comments which seems incongruous with what I’d expect or hope to find in the article, that’s a good prompt to go ahead and read it to gain context.
The words offered up as a quote are meant to represent the views of the person being quoted. In this instance that is clearly not the case.
This is a perfect example of how quotes can be used to misrepresented a view.