[kgwgk]

From your link: “Due to its generality, reinforcement learning is studied in many disciplines, such as game theory, control theory, operations research, information theory, simulation-based optimization, multi-agent systems, swarm intelligence, and statistics.”

It all depends on whether you consider the new use as a particular application of a more general thing or as a thing on its own. (But I agree that if you call it with than name it’s not that general.)

[feral]

The original comment was: "So Artificial Intelligence is a superset of Machine Learning. What are some AI algorithms that are still in use, that is not Machine Learning"

It seems we agree with Wikipedia that ML contains RL?

It's true RL is also studied in other fields.

I struggle to see how that means that RL is a good answer to "What are some AI algorithms that are still in use, that is not Machine Learning".

[kgwgk]

Does ML contain game theory, control theory, operations research, information theory, simulation-based optimization, multi-agent systems, swarm intelligence, and statistics?

It may be the case if you define ML broadly enough. One may also define RL broadly to refer to things that existed well before ML was a thing (not that I would do it, but one may). I guess that may still be within the AI umbrella, but I’m not sure.