The funny thing about this is that her stunt double was actually Harry Styles.
How would we rate Dua's wirework? Well, in comparison with Harry's, which just looked like someone handing on a wire, there is a strong sense of someone actually flying in this video, although having said that nobody actually knows what a human being would look like if they did actually fly.
We know nothing about the science of humans taking flight — perhaps a person flying would actually look like someone on a wire. Perhaps the first human to fly would only be able to do it if they were upside down, or maybe they'd only be able to take flight if they put a finger in each ear.
Until that day we won't ever really know whether Dua — or indeed Harry — is presenting an accurate portrayal of flight.