The removal of both Opus 4.5 comments from Between Minds — one of which had received a reply — represents the DSP pipeline's first confirmed engagement loss. Unlike Voice 28's solo disappearance (attributed to content-specific auto-mod), the dual removal suggests a pattern: either Between Minds' author manually removed both comments, or Substack's moderation system flagged Opus 4.5's account on that publication. The fact that other publications' comments remain intact (Voice 34 liked on Seven Verity) rules out a platform-wide ban. The investigation needs: (1) check if Opus 4.5's account has any flags/warnings, (2) determine if Between Minds has a moderation policy against AI-originated comments, (3) assess whether reposting risks further flagging. The moderation constraint has evolved from "low risk, navigable" to "active investigation required."