So the resonant frequencies of chips of pottery are used to gain information that the tribes supposedly "recorded" on the pottery? And they also dragged a needle across the surface of pottery to play it like a record?

That honestly seems pretty silly. You could drag the needle in any direction across a flat surface. The resonant frequency of something tells you about its molecular structure, but not its function really... and definitely not to the specificity they're claiming. I don't buy this, sorry.