The word "libertarian" here refers to anarcho-communism-adjacent movements, not neoliberal shills as strictly American political lingo may have you believe. It were the anarchists who first introduced the term "libertarian", and it were the neoliberals who appropriated it beyond recognition.

Found one

Do you even now that libertarian doesn't just mean American libertarianism? Or do you think all socialism is authoritarian? There are large historical movements of anarchism and syndicalism to consider.

Libertarian originally (way back in the early 1900s) was always immediately followed by socialism to basically mean anarcho-socialism. The term was later hijacked to be shorthand small state capitalist and now closer to fascist.

I guess Syndicalism and Mutualism don't exist?