It is very straightforward in that he has been using Apple for a while and made concessions on his idea of software freedom to use the "convenience of Apple products". however, with Apple's recent attempt to slip in on device scanning and reporting to police agencies and setting a precedent that this is acceptable it has pushed him over the edge. Even though apple backed off, they did just add the scan for nekkid pictures on your imessage if you're a kid and report it to your parents. He assume this is just step 0.1 of a multistep process to reinstate the scan all the things on your phone and report back to 3rd parties. He may be right, and it certainly wasn't hard to follow if you read it rather than scan it.