I hear what you are saying but in this case, the guest mentioning the lack of refund in a review that is less than excellent after not even having stayed at the listing, would in and of itself touch on all 3 of the things that get a review removed: airbnb case status, review extortion and irrelevance.
Nothing is cut and dry with airbnb as we all know but I’d feel confident in getting that review removed. I would actually be crossing-my-fingers that the guest mentioned not getting a refund in the review so that I could then have it removed.