Never before have scientists been privy to the star birth from a cluster. Usually star formations have something present that prevents the star births. When a black hole, particularly a supermassive one, is active it can be emitting enough particles to reheat the core making the gases unable to cool down to become a new star.
The Phoenix cluster has in incredible amount of gas cooling at an intense rate and giving birth as if there were no tomorrow. And it may be correct. Once the black hole awakens, the gases won’t be able to cool and the Phoenix Cluster will be cease producing celestial bodies at unheard of rate.