We've been here before, you're twisting what the documentation says and then interpreting in the way you want to.
No, I'm not. The documentation is darn clear, there isn't even room for interpretation. You're the one trying to read to much into it and invent things that aren't there.
For In-App purchases, Apple processes your payment. That's it, you get to deal with getting whatever you promised to your customer. 30%.