No details in the article of what the exploit accomplishes or what is required in order to achieve the exploit, except that it is a hardware issue in the A11 Bi

No details in the article of what the exploit accomplishes or what is required in order to achieve the exploit, except that it is a hardware issue in the A11 Bionic chip, which exists in iPhone 8, 8S, and X. Not present in the A12 and A13 Secure Enclave.