Q44 in-demand-vs-not-in-demand-movies

I am not sure why my answer is wrong

/*
    1. For data safety, only SELECT statements are allowed
    2. Results have been capped at 200 rows
*/

with tmp as 
  (
  select extract(month from r.rental_ts) as month,
            extract(year from r.rental_ts) as year,
            f.film_id,
            count(r.rental_id) as rentals
  from film f 
  left join inventory i on i.film_id = f.film_id
  left join rental r on r.inventory_id = i.inventory_id
  and extract(month from r.rental_ts) = 5 
  and extract(year from r.rental_ts) = 2020
  group by 1,2,3
  )
  
  select case when rentals > 1 then 'in demand' 
               else 'not in demand' end as demand_category,
               count(film_id) as count
               from tmp
               group by demand_category

I would love to have an explanation how this query is different from the actual answer.
Thanks