Does selling imply ownership?

I disagree with a lot of what he says here, and I guess it should bug me that someone I don't even like has persuaded me that I've been wrong on an important question, but I'm grateful to Kinsella here for correcting me on self-ownership by addressing my exact argument for rejecting it in terms I simply can't disagree with.

I have always said that since I can't sell myself, I don't own myself. Self-ownership being widely regarded as a foundational principle of libertarianism, rejecting it has made things a bit tricky for me, and I'm happy to be (back) on the right path, or so I currently think.

This is not very important, but I don't dislike him because of his beliefs or his moral character or anything, he just isn't a nice person (I don't even think he'd disagree with this assessment).