I agree that part sounds very ChatGPT-ish (and I didn't notice it before), but just one line generated by AI doesn't indicate to me the text was mostly generate

I agree that part sounds very ChatGPT-ish (and I didn't notice it before), but just one line generated by AI doesn't indicate to me the text was mostly generated by AI... does it to you? I could totally see the original text being improved by AI here and there in small pieces.