...only until August, which is the entire point of this post. The very documentation you link to says "Additionally, your app will not be able to support Androi

...only until August, which is the entire point of this post. The very documentation you link to says "Additionally, your app will not be able to support Android App Bundles, Play Feature Delivery and Play Asset Delivery."; but, starting in August, all new apps must use bundles, and thereby will no longer be compatible with opting out of sending Google your signing key.