There's a clause which mentions that if they receive a legal claim based on your content they'll send you
another email asking you to indemnify them, which you may or may not choose to reply to in the unlikely event of it actually happening
(presumably this time, since it's more serious, it'll be opt in, and exactly like DMCA requests they'll take the content off their digital property if you don't explicitly agree to indemnify them and assert your right to publish the content)
Again, I don't see any issue to take with the wording acknowledging the existence of a process whereby their lawyers might send me an email in the event of future complaints. There is no indemnification clause unless and until you receive that email and respond by agreeing to indemnify Apple.