Could you elaborate? Totally unclear to me what kind of attack you're talking about.
This seems... implausibly convoluted. If you have full remote control of someone's phone, Apple or not, you could do all sorts of incriminating things "as them", and I don't think Apple's new system noticeably increases your risk from this.
It would take the flick of a switch for someone to ruin your life for a crime you could never explain yourself out of. Nobody will ever believe that you were framed because that means other convicted predators could also have been framed. As soon as your name hits an index-able news article, guilty or not, your life is over.
This is a blackmail machine.
I'm just saying that actually getting the attention of authorities is the most trivial part of this suggested attack. Apple's new stuff is a vector for that, sure, but anyone who is in a position to exploit it could easily do so in other ways as well.
iCloud was just the start, it wasn't the end.
For more sensitive materials back up when the data changes and store in a disaster proof safe.
I think the fear of losing things is a problem. People take so many photos anyway and who even looks at all of them? Memories are great and we should cherish them but… this is one of those cases where folks don’t need to rely on big tech.