You can have the AI explain it to you. There's also a middle ground between vibe coding and "I can code some things but never could have coded this without an AI".
Doesn't even have to be AI. Give me some random file from the Linux kernel and I could probably explain everything to you if you gave me a few hours. But that doesn't mean I would ever be able to write that code.
I don’t disagree, but in those interviews the explanation is also a bit of a q&a, so an effective interviewer can detect candidates who only memorized things. Someone who can ace a q&a about Linux code is already better than average.