You are wrong. Apple merely said "no backdoors will be created into any of our systems".
And no backdoors into any of Apple's systems are necessary because a government-owned company will be operating iCloud, including the keystore.
Apple's terms of service make this very clear:
"You understand and agree that Apple and GCBD will have access to all data that you store on this service"
https://www.apple.com/legal/internet-services/icloud/en/gcbd...