Read the list slowly and the ordering principle keeps switching underneath you. Steps 1–10, totalitarianism down to constitutional monarchy, are ranked by one question: how much authority is concentrated in the state. That is a real ruler. It is the vertical axis of this site's map, read from the top down.
At step 11 the question quietly changes. Federal democracy, confederation, municipalism: these are not less authoritarian than a constitutional monarchy in any measured sense. They are ranked by where authority sits territorially, which is a different question wearing the same numbering.
At step 14 it changes again. Participatory, deliberative, consensus, direct: these are claims about the depth and method of participation. Two of them are not locations at all. Deliberative and consensus democracy are decision procedures that can run inside almost any ownership regime, which is why their dots get a wide, honest fuzz on the map.
And at step 18 the state disappears entirely, and the ruler becomes the horizontal axis. From libertarian socialism to agorism, every remaining system is stateless; the only thing left to rank them by is economics, collective on one end, private on the other. Twelve of the twenty-nine steps, more than forty percent of the "spectrum," are distinctions the left-right line claims do not exist.