Correct! If you download your app from play store then you will not see any dialog in the app!
But Iam sure that you and other people forget that you dont download from playstore for testing!
Because you download for testing from our creator!
You want to test your app if the dialog is not visible?
Deinstall your app on your phone and download it from playstore!
And one more thing:
An app which is on Google Play Store does not need to be approved by us!
Means:
If you download the app from playstore then you dont need to have a approved app to get ads!