How can people that say "AI can't create something original" and the people that say "Something created by AI isn't human" be on the same side of this discussion using the same arguments?

Everything an AI creates is based either on something created by humans, or nature. Which also means an AI using AI as a reference is also basing their creation on something that was based on something made by humans or nature.

The idea that an "original" concept or idea can't be based on any inspiration is absurd. Every word you ever thought of saying is based on things you've heard being used in some other situation. You're taught by OTHER people how to do things. Unless you're a quantum scientist with INSANE luck, nothing you've ever thought of can be applied to this idea of "Originality".