Nielsen's fixfluence is the right move: grade research on whether the product got fixed rather than on whether the AI matched a human coder, since the humans never agreed with each other either. The verb is where I'd push. Shipped is the half the team controls.
The landed check is cheap because the instrument that found the theme can run it. Keep the codebook, re-code the next batch, report which themes shrank. The theme that didn't shrink is the next finding.
The 31-call and 3-call themes, the 11 and 9 theme counts, and the two rules are in The Three-Call Theme Was the Renewal. Count What Landed, Not Fixes. The week itself is Ship Story: The Discovery Week I Ran With Three Agents and No Calls.