That is not even remotely similar to the claim you made. Nowhere in that sentence is the claim that privacy and security cannot exist without a vertically integrated corporation.
All they're saying is that the existence of third party software compromises Apple's ability to make blanket statements about the security and privacy of this one specific platform. An unofficial third party client breaks an established network of trust — which is an objective fact. If you doubt this, then you really should use this Chromium fork I just developed. Use it to log into your internet banking. Don't be scared. There's nothing to worry about. See, there's a lock symbol in the address bar and everything.
All they're saying is that the existence of third party software compromises Apple's ability to make blanket statements about the security and privacy of this one specific platform. An unofficial third party client breaks an established network of trust — which is an objective fact. If you doubt this, then you really should use this Chromium fork I just developed. Use it to log into your internet banking. Don't be scared. There's nothing to worry about. See, there's a lock symbol in the address bar and everything.