Zero-shot learning is a way of essentially building classifiers. There's no reasoning, there's no planning, there's no commonsense knowledge (not in a comprehensive, deep way that we would look for it call it that), and there's no integration of these skills to solve common goals. You can't take GPT and say ok turn that into a robot that can clean my house, take care of my kids, cook dinner, and then be a great dinner guest companion.
If you really probe at GPT, you'll see anything that goes beyond an initial sentence or two really starts to show how it's purely superficial in terms of understanding & intelligence; it's basically a really amazing version of Searle's Chinese room argument.