A capitalist is someone who owns capital, not someone who supports capitalism. A liberal is someone who supports capitalism. I don’t think Linus is a liberal, given that he’s the Linux guy. But he’s obviously a capitalist, and that’s okay, that’s something you should strive towards if you live under capitalism, even if ideologically you oppose capitalism.

thought-terminating cliché

There’s no argument, it’s the definition of the word. Why do you assume there should be argument around the normal usage of a word?