I don't think AI will create a coin superior to Bitcoin. However, various tasks can be performed with AI. For example it can develop a more successful bot for trading. When trading, bots usually trigger each other, that leading to sharper ups and downs. Since the amount of circulating coins used for trading is decreasing daily, this could pose a minor threat. We may see more volatile price movements. Other than that, I don't think AI will pose a serious threat to Bitcoin.
I trust your statement. AI can never be a threat to bitcoin. Although AI can be employed in the development of bitcoin if the need arises, but AI cannot make a coin more powerful than bitcoin. I will rather invest in Bitcoin with proven node runners and developers maintaining the network than to leave the network security in the hand of an AI.
Don't be too thrilled by AI because as AI dominance increases, time will come that the demand of humans and humanity feels will be scarce and becomes an asset.