You are correct that privacy is not necessary for security. But here, Apple is arguing that security is necessary for privacy. This seems to me obviously true.

You are correct that privacy is not necessary for security. But here, Apple is arguing that security is necessary for privacy. This seems to me obviously true. If a system isn't secure, it cannot safely store private data. Think about this in the extreme: imagine your computation platform is a virtual machine on a hypervisor controlled by your adversary. There would be no way to use this platform to safely interact with your private data.