That's an interesting way of looking at it, though I do disagree. Mainly because, as you mention, it would be silly to claim that water is intelligent if it can be used to solve a problem. That would imply that any human-made tool is intelligent, which is borderline absurd.

This is why I think it's important that if we're going to call these tools intelligent, then they must follow the processes that humans do to showcase that intelligence. Scoring high on a benchmark is not a good indicator of this, in the same way that a human scoring high on a test isn't. It's just one convenient way we have of judging this, and a very flawed one at that.

Anyway, cheers for the discussion!