Direct quote from their joint statement: "Apple and Google have entered into a multi-year collaboration under which the next generation of Apple Foundation Models will be based on Google's Gemini models and cloud technology. These models will help power future Apple Intelligence features, including a more personalized Siri coming this year."

Source: https://blog.google/company-news/inside-google/company-annou...

I think Apple would also still like to publicly say it's Apple's model, not Google's.

‘Based on’ implies an LoRA or some fine tuning.

It clarifies exactly what was being questioned.