It's like the instructions for using ChatGPT to do the grunt work of constructing text, which not being a fan of prose or well-schooled in prose, the author equates with good prose, not realising that writing good prose, at length, is an art and a craft. Oops too many commas.
I guess the part I'm missing, then, is where the author implies that the resulting document is "good prose". One could read such an implication into what's been written here, I suppose. But to me I read more that this technique is just about a producing something useful, not necessarily good (if by "good" we mean "equal in quality to what a skilled writer would have produced after many hours of deep thought").
Not every email we send needs to win a Pulitzer prize, after all.
It seems to me like a technique for taking some rough stream of consciousness and have ChatGPT generate a complete, fleshed out document from it. It's more than just "notes", it's a specific format and prompt.
Whether it's of any use to you personally (I don't see myself using it, really) is a separate question. But I also don't quite follow what is offensive about it.