He did change the quote, which is puzzling since Miller is one of the straightest people on this board, but he responded to your post as if it were the original.
In your original, you said “and a tough [edge case], I’m sure.”
Miller’s quote changed it to “but I don’t think it’s a tough [edge case] at all,” but then responded with:
That response makes more sense when addressing the original post rather than the edit.
In either case, it appears to be a small change, and not all that significant as claimed.