The author does not call people leftists or rightist, but rather associates language and causes with the left or right. He points out that cyber-libertarianism tend to use the terminology of the left ("freedom", "open"), while embracing the values of the right. Not every one on every issue, but as a pattern of behavior across many issues. The article points out that because of this language, people who otherwise identify with leftist causes end up supporting cyber-libertarian policies that further rightist causes.

I think the best thing in the article is about the different definitions of "freedom." Cyberlibertarians use "freedom" to mean "freedom from." This is quite incompatible with what many leftists,[1] might mean by "freedom," specifically the freedom of the masses to act collectively to shape their society.

[1] And indeed, many who would probably consider themselves "conservatives" in a pre-Tea Party world.