In May 1995, after Mary Karr warned Pietsch that Ennet House scenes drew on confidential Granada House/AA talk, Wallace changed names and details and added the…

This is a revision: the same material was reworked in substance between draft and print.

In the published book. This concerns the book as a whole rather than a single scene. (Ennet House strands); copyright page

Evidence. A single source reports this. (archive-sourced). Documented by D.T. Max's biography of Wallace.

Further notes. The "strongly worded but evasive denial" on the copyright page is itself a manuscript-difference artifact. Post-publication, Wallace systematically dissembled about his recovery history for the same anonymity reasons D.T. Max's biography of Wallace — weigh this when treating author interviews as evidence.