The UN Declaration of Universal Human Rights, signed by the vast majority of nations says "Everyone has the right to freedom of opinion and expression; this right includes freedom to hold opinions without interference and to seek, receive and impart information and ideas through any media and regardless of frontiers." So I think he is in fact entitled to say how all of open source ought to work.
I don't see how I made your point. There is a big difference between freedom to express and freedom from compulsion. He hasn't claimed that others don't have freedom to express - he has claimed that their expectations of him don't entitle them to his labor.
Another right from that same document states, "No one shall be held in slavery or servitude; slavery and the slave trade shall be prohibited in all their forms."
