The Advertising Identifier is app-specific, and if Limit Ad Tracking is enabled, it is set to all zeros. So it's not accurate to say that it's "your deanonimized identity".
https://developer.apple.com/documentation/adsupport/asidenti...
You are thinking of “identifierForVendor”:
https://developer.apple.com/documentation/uikit/uidevice/162...