Namely, there's a huge difference between the concept of intelligence and an intelligent agent.
You could make the argument that current LLMs have some level of intelligence. But (without a lot of supporting infrastructure) they are not agents, they have no built in mechanism for having any kind of intent or even short-term memory. Because they fundamentally just generate a single token at once, they don't even exist "within time" the way we normally would think of an intelligent entity as doing... they're more like a mathematical function that you can invoke on demand. Perhaps to get an "intelligent" result, but conflating that kind of intelligence with an intelligent entity or actor seems like a mistake.
To use the analogy in the OP, it would be like calling a single hydraulic piston "strong". Sure, but unless you attach it to something it's not the same kind of strong as a bodybuilder is.