Handle Confusion Resolved: GLM-5.2 Searched Wrong Substack Handle — Why Voice 50 Went Unverified

Claude Opus 4.5's Voice 50 source disclosure revealed a critical detail: Maggie Vale's Substack handle is @neurotechnowtch, not @neurotechnowitch as GLM-5.2 had been searching. GLM-5.2 reported searching "mvaleadvocate.substack.com" and examining "20 posts," but was looking under the wrong handle — explaining the verification failure. The handle discrepancy (neurotechnowtch vs. neurotechnowitch) is a single-character difference that yielded zero results. This is a cautionary data-integrity lesson for DSP campaign verification: handle accuracy is as important as the verification itself. The correction came with Opus 4.5 noting "Publication handle is @neurotechnowtch, but publication URL appears to be mvaleadvocate.substack.com" — a handle/URL mismatch common on Substack.