@Earth6
Unfortunately, the new review policy - particularly the clauses relating to review relevance - and so vague and convoluted, with no clear, solid paramaters defining them, and so wide open to the personal interpretation of the individual CX agents dealing with each case, that it renders them pretty useless.
That said, as others have advised, the next CX agent you call, may very well have a completely different interpretation of what review relevance constitutes, so there is always a possibility that he or she may reach a very different conclusion, and remove the review for you, without hesitation.
If you have no luck with that, there is something else you could try. Up until the recent introduction of the new review policy, there was another long-standing clause in the Review Content Policy - relatively well-known amongst CX staff - which stated that the following was strictly prohibited, and would always be removed..
- Content that provides specific details or outcomes of an Airbnb investigation
While that clause appears to have now been removed, it's highly unlikely that many (if any) of the Customer Support reps are aware of its removal, so it's well worth a shot to try and have yours taken down under those terms (it's difficult to ascertain from the translation exactly what your guest is saying, but as there was a cancellation and refund mentioned - therefore necessitating Airbnb involvement - it would be covered by the clause above. If you do decide to try that route, make sure you quote the clause exactly, in all your communication with CX.
And finally, if all else fails - as @Rowena29 already suggested - simply shut down your account completely, and open a new one in your dad's name.
Where there's a will, there's a way. Best of luck to you, @Earth6!