I would normally agree, but in this case, the "libertarian website" is actually an encyclopedia article by Robert Heilbroner. Also, the above definition seems to be in agreement with alternative sources.

Oxford Dictionaries:

a political and economic theory of social organization that advocates that the means of production, distribution, and exchange should be owned or regulated by the community as a whole.

Merriam-Webster:

any of various economic and political theories advocating collective or governmental ownership and administration of the means of production and distribution of goods

New Advent:

A system of social and economic organization that would substitute state monopoly for private ownership of the sources of production and means of distribution, and would concentrate under the control of the secular governing authority the chief activities of human life.