That sounds like a very useful skill for a working player. But it seems to come with a couple of significant conditions.

I can believe this is possible. But I don't think this is a reasonable thing as a baseline expectation for a player with 6 weeks of experience, which was the original comment in this thread.

I don't know the details, but I imagine you're feeling beats transmitted through the neck or something. But if that is the case (an assumption) it still requires you to have at least one known-good string, unless you're playing solo.

So, for these circumstances, and others, a pedal-based or clip-on headstock tuner seem like they still have plenty of practical application.