The question is motive. Apple's business model isn't predicated on having a lot of data on you. They have to keep a list of your purchase history for instance so you can redownload purchases.
Also, why would they risk lying? What's in it for them?
Also, why would they risk lying? What's in it for them?
Depending on your threat model in regards to your privacy the assurances made by Apple may be enough.
To me, it doesn't really matter. As long as I have no proof or control over how my data is being processed, it's better to just assume the worst case and practice data minimisation.