No its about traditional physics based models vs Machine Learning models (or AI). Google's model isn't using LLMs, but still uses deep learning models to predict the weather. Per the article:

At that point, many of the physics-based computer models, which rely on mathematical equations describing how the atmosphere works to simulate future weather conditions, were vacillating between different projections but generally forecasting a weaker storm that would take a different track than the DeepMind and other AI models were showing.

The original commentors point is valid in that we just call everything AI right now. While it's not a terrible term for ML models, the general public largely associates AI with LLMs which is a misnomer.

They weren't using machine learning models before. They were using physics models which just run simulations on a given set of equations, with a given set of assumptions (which are where the models all differ, those underlying assumptions).

They did not point to a single example though either. They pointed to several. The WeatherNext model has been outperforming the traditional models on everything over the past year. Consistently.