Mostly because it’s dependent on who told you “Comunism is a flavor of old-world authoritarianism, based upon the idea that mankind is incapable of choosing the right thing, so the right choice is instead mandated by law.”
A good working definition of the ideas of communism is democracy of the work place and the economy. As it stands work places are dictatorships run by bosses that effectively have unilateral control over all choices of the company. Socialism and communism are built on the idea since workers are the ones actually doing the work that make the money and bare the brunt of the choices, they should be the ones making the choices.
Really it’s actually capitalism that supposes people are too dumb to make their own choices or know how a business is run, and thus shouldn’t have say over company choices.
Yes dumping industrial waste into the town water ways, buying up all competition, off-shoring labor, and paying employees as little as they can get away with, are all well incentivized market systems.
Individual business being allowed to be cooperatively owned does not equate an economy where individual ownership of the means of production is disallowed. And as every facet of society seems to being increasingly enshitified while we barrel towards climate collapse, I don’t really feel the need to argue that strict market only economic systems are fundamentally flawed and have outlived their use.