This article shows a fundamental misunderstanding of the functionality of "App Tracking Transparency", and I will admit the text "ask app not to track" is confusing.
ATT, when a user selects "no", blocks the app from accessing your device ID. This makes it so that even though the app can still track what you do in their app, they can't connect that to the data collected from other apps through your device ID, and therefore build a profile of you as a person.
ATT, when a user selects "no", blocks the app from accessing your device ID. This makes it so that even though the app can still track what you do in their app, they can't connect that to the data collected from other apps through your device ID, and therefore build a profile of you as a person.