The problem is "knowing their salt to do recruiting" is very hard. In all places I've been, the kinds of interview we are talking about here (technical problems, etc...) are delegated to regular engineers. So those technical interviewers are likely great at reading and writing the code, but they many not be the best at spotting fake AI.

(The recruiters only come in for non-technical parts like resume filtering, general information and benefits. Sometimes there is non-technical "culture fit" interview, that is usually some sort of middle manager from the department doing the hiring)