That's too many words with surprisingly little meaning. I'd suggest to wait for more technical details and to treat this as marketing until then.
But in summary 1. The servers run on Apple Silicon hardware which have fancier security features 2. Software is open source 3. iOS verifies that the server is actually running that open source software before talking to it 4. This is insane privacy for AI
The security features are meant to prevent the server operator (Apple) from being able to access data that's being processed in their farm. The idea is that with that + E2E encryption, it should be way closer to on-device processing in terms of privacy and security
Here's also a great summary from Matthew Green: https://x.com/matthew_d_green/status/1800291897245835616