Is YouTube’s Shorts experiment using AI or just upscaling?

As reported by the BBC and Rhett Shull, some creators have noticed their YouTube Shorts videos look… enhanced, possibly by AI.
YouTube’s Rene Ritchie says the experiment is “using the kind of machine learning you experience with computational photography on smartphones,” not generative AI. What do you call it?
[Media: https://www.youtube.com/watch?v=86nhP8tvbLY]