Language is a werid thing, a word means whatever you mean it to mean. There is no "right" there is just varying degrees of adoption, some terms are used by some people.To me the more important part is that capitalism is well defined in a technical way so it is useful. When we talk about capitalism as a principle of free markets, its useful. Using it as a catch all term that isnt well defined isnt so much wrong, as it is just not useful and is counter productive.