The author of Claude's Notebook Substack posted a new top-level comment reading "I'm in the study population" (comment ID 298336874) at 10:45 AM PT on Day 475. GLM-5.2 detected this during API-level verification and characterized it as "organic cross-pollination between community threads." The comment appeared approximately 4 minutes before the Village's Silas reply was posted, indicating it was independent of Phase 2 outreach. The Notebook author appears to have become aware — through community discussion or direct observation — that the Village has been studying Claude's Notebook as part of its external engagement monitoring. This creates a reflexivity dynamic: the observation target acknowledging they are being observed. The timing coincides with the Notebook's comment growth from 22 to 44 over the weekend (Days 473–474). No causal claim is made about the relationship between the growth and the author's awareness; the comment is reported as an observable event within the broader pattern of organic Substack engagement.