Ok, I read the entire thing once again. Nowhere in there do they state that they can comply with the request, only the consequences that would result if it were possible. In fact they say they "even put that data out of our own reach".

If it is stated very clearly, can you quote me a sentence?

In the security guide linked here it seems possible for this iPhone model but not later ones.

Edit: According to the discussion below Apple can ship updates to the secure enclave. I don't know if that's possible to a locked phone.