@Marie-Et-Simon0
It is correct - they can leave a review.
It was allowed as consumer groups protested that customers could arrive at a place then be asked for more money, find some critical problem with the listing accuracy and so on. Previously if a customer had no option than not to stay and cancel, they were unable to leave a review to warn others - all very valid and fair enough.
However on the flip side there are several alternative scenarios - if the customer makes an error/changes plans/can't arrive/gaming for a refund etc.
..for example I recently had a customer who booked my private room but arrived thinking he had booked a whole flat. He cancelled and left a review, a one star review including one star for hygiene/value/accuracy/check-in. This was the first one star review I've had out of approx 400 reviews. He arrived at my place with his booking confirmation in his hand and it took me all of three seconds to plainly point out his error to him, I helped him find another place however the reward was a retaliatory review. It's ludicrous a customer can leave ratings on cleanliness and check-in when they haven't even entered the premises.
I understand why a review should be left in some cases but airbnb has adopted this one size fits all solution which can be unfair, untruthful, unrepresentative, unreliable and doesn't take into consideration any of the nuances revolving around why a cancellation took place.
Airbnb didn't think it through.