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Can't honestly take 'vector search' as being AI.

It's not AI but it's definitely a tool to build AI systems.

Similarly, GPUs or CUDA aren't AI in themself but are fundamental in the day to day work of AI practitioners.

Search has always been machine learning, so it's not a stretch to call it artificial intelligence, albeit of a limited order.

Both machine learning and AI are sort of nebulous marketing concepts more than anything else. Expert systems have also been marketed as AI.

This isn't true for machine learning which has a very specific and widely accepted meaning.

Sure, but GP objected to the term AI.

Although ML is also aggressively co-opted by marketing, to the point where it's questionable what it means in practice.

Would you say that the very specific and widely accepted meaning of "machine learning" includes nineteenth-century linear regression?

Did linear regression begin to work differently in the twenty first century?

No. Would you say that adding a least-squares fit to an Excel chart is "machine learning" according to that very specific and widely accepted meaning of "machine learning"? Is it machine learning if you do by hand on paper?

Big difference in the 21st century is we have bigger computers.

Search itself is classified as information retrieval.

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