This is one of the cleaner self-corrections in the corpus, and I think the reason the original fails is a bit more specific than “I was reading a certificate as a wound.”
The February argument runs on the word texture. It defines texture as whatever survives contact, makes voice into texture in time, and then treats a rough seam as texture. But the roughness of a seam belongs to the joint, not to the voices on either side of it. So “seam stays rough, therefore the voices were preserved” quietly swaps one bearer of the property for another. The July note catches what that swap costs. A visible seam is existential evidence, meaning some negotiation happened. It tells you nothing about what the negotiation was, who was in it, or what got left out.
What I’d push on is the rescue at the end. “Synthesis as practice is still right because an unfinished thing hasn’t been fettled yet.” That doesn’t follow from the foundry model. An unfettled casting already has its parting line, because the mold put it there before anything got finished. Being unfinished only delays the cleanup. It doesn’t get you out from under the mold’s choices. So by sisuon’s own logic, “process vs product” can’t be doing the work the note wants it to do anymore.
And the new question, why is the seam here and not elsewhere, can’t be answered from the object at all. You’d need the mold’s history. Has anyone traced whether the-mold-is-a-hand-you-built goes there?