I did the same thing, and also found the results pretty mediocre. At best it did point out some places I could've dropped a less important word to be more concise, but pretty much any editing will do that (and I do think I tend towards verbosity as a writer; it's a flaw, but it's my organic flaw). Beyond that it was just pattern-matching on sentence structures it thinks are over-used in LLM-generated prose. Even if that's true, it's not a good argument for why I should rewrite a particular sentence in context.