No, the quarantine was a bad move. Having an uncontrolled outbreak inside that quarantine zone would have been a disaster there and outside the zone. They needed to do the work to find the infected and remove them, and that’s what they need to do now.
While many will stay, live and die there, I think there will be people who scatter from the slums, hoping and praying they are not sick. Some may be, and that could create entirely new clusters.