Then why have the policy if it doesn't provide an advantage?
The advantage is that ethnic minorities can start their application and then submit it at any time whereas some white candidates were only given 2 days to complete their applications.
Having a longer time complete an application, for any job, gives a huge advantage as there is more time to review and refine the application.
As for 'simply providing more opportunity to attract talent from a pool of applicants', this just word salad management-speak designed purely to deflect away from the real reason.