I do tend to give reviewers the benefit of the doubt, that they intend good, even if they’re expressing it rather poorly. I can easily be wrong.
Entirely okay. My style would start it off like “Footsteps; {name}’s ears twitched.” But, that’s more my style, which I’ve evolved/refined over time, some with input from others. But a “It’s wrong, lemme rewrite it...” No, they can write their own, or, once you’re publishing, write a fanfic in their favorite style*
* As an aside, this leads to an interesting question once published. If author doesn’t remove all of their stories in the said story-universe and somebody else starts to post fanfiction in the archive, does the author’s works remain in originals, or should they move them into the fanfic archive?