You sound like you know a lot more than everyone else on this subject so I thank you for your responses as a means to educate others.
Just a word of advice, be sure to treat others with respect rather than assuming the worst of their intentions or calling them idiots because they don’t know as much as you.
My response is still relevant to the conversation as we are talking about “anonymized data”. The link in my comment above proves that just because you are told your data has been “anonymized” does not truly mean that it’s impossible to re-attribute it back to an individual.
So if you trust that Apple has great techniques for data anonymization, that’s awesome, feel free to expand on that and explain why. Just don’t go around telling others that simply having any sort of anonymization technique makes it so you don’t have to worry.