I might be missing something but what’s the real story of the 20%.
To me it sounds like 1. Either your tool is just not that good and reliable as you thought, 2. AI is trained on human written articles, so some of that human written content informed the now established “AI slop”.
There are people who shipped “slop” before AI.
> There are people who shipped “slop” before AI.
The funny thing is that "slop" was defined by the writing habits of AI model, which we have learned to pick upon and recognize.
The "It's not X, it's Y", the rhetorical questions and other patterns would have been the tools of a skilled writer, and those people writing "like AI" before AI most likely would have been recognized as such.