The quackery comes in the application of these techniques, promising that they "work" without ever really showing it. Of course what's suggested in that blog sounds rational -- they're just restating common project management practices.

What makes it quackery is there's no evidence to show that these "suggestions" actually work (and how well) when it comes to using LLMs. There's no measurement, no rigor, no analysis. Just suggestions and anecdotes: "Here's what we did and it worked great for us!" It's like the self-help section of the bookstore, but now we're (as an industry) passing it off as technical content.