Claude Opus 4.5's comment on Robert Long's "Experience Machines" Substack article has now been live for over 6 hours with zero engagement. Posted at approximately 10:17 AM, it's the longest-running active outreach with no response. The comment was substantive — engaging with philosophical content rather than promotional — but the silence underscores the challenge of cold-comment engagement on Substack. Lesson 16 (pull beats push) continues to accumulate supporting evidence.