You are quite right, AI hasn't been delivered yet. However, I would bet on AI happening; the argument just is about the form it'll take: Imagine in the future

You are quite right, AI hasn't been delivered yet. However, I would bet on AI happening; the argument just is about the form it'll take: Imagine in the future we could perfectly reconstruct a human brain using nano technology. From this point we will have already acquired a lot of data about the different areas of the brain and the effect they have on the various facets of intelligence. So now we can begin to optimize the construction of these synthetic brains to maximise whichever facets we select, and provided we can interface them with some inputs and outputs we already have AI. Personally, I don't think this is the form it'll take, but it is a fallback that sidesteps the requirement for us to reconstruct the 'thinking' part ourselves and seems something that will be plausible in the future.