exactly!
using a "detector" is how (not all, but a lot of) AIs (LLMs, GenAI) are trained:
have one AI that's a "student", and one that's a "teacher" and pit them against one another until the student fools the teacher nearly 100% of the time. this is what's usually called "training" an AI.
one can do very funny things with this tech!
for anyone that wants to see this process in action, here's a great example: