Do you have any proof this is happening?

This is Apple we are talking about, which has the strongest privacy commitment of any device maker, and no advertising business outside of the App Store. Linking IP addresses to app certificate requests provides them zero benefit and exposes them to substantial brand damage.

Do I have proof they have your ip address? Of course, that's how the internet works.

Do I have proof that they could be ordered by a court to store it? Of course, that's how warrants work.

Do I have proof they are currently storing it? No, nor was that ever the claim.

Then the claim is ridiculous. Apple isn’t keeping any of this info, because it would have no purpose.