The window in your print screen is for ATT tracking, and this is just an information message (the IDFA explainer), to open the system alert. This window is not where you define if you allow it or not. The ios developer guide tells you to just have one button that states Continue. This is exactly what you get if you use the Google messages. It also just state Continue, and when pressed you get the ATT prompt.
See this example:
I think you are confused with the GDPR message, but this is not it.