“A randomly generated UID is fused into the SoC at manufacturing time. Starting with A9 SoCs, the UID is generated by the Secure Enclave TRNG during manufacturing and written to the fuses using a software process that runs entirely in the Secure Enclave. This process protects the UID from being visible outside the device during manufacturing and therefore isn’t available for access or storage by Apple or any of its suppliers.“
Sure, and even Apple can't imitate a different server that they made.
They're making new servers though. Take the keys that are used to vouch for the UIDs in actual secure enclaves, and use them to vouch for the UID in your evil simulated "secure" enclave. Your simulated secure enclave doesn't present as any particular real secure enclave, it just presents as a newly made secure enclave that Apple has vouched for as being a secure enclave.
“A randomly generated UID is fused into the SoC at manufacturing time. Starting with A9 SoCs, the UID is generated by the Secure Enclave TRNG during manufacturing and written to the fuses using a software process that runs entirely in the Secure Enclave. This process protects the UID from being visible outside the device during manufacturing and therefore isn’t available for access or storage by Apple or any of its suppliers.“