The goal is to wipe the slate clean and rebuild from the foundation.
"The Camden County Police Department rehired most of the laid-off cops, along with nearly 100 other officers, but at much lower salaries and with fewer benefits than they had received from the city."
So the solution was to keep most of the cops (which I agree with) and then pay them less (which I, umm... I mean... that doesn't seem like a recipe for success but eh).
From that article it sounds like it's too early to tell if it worked. Is the new police force doing better than the old one?
The Norther Ireland article specifically covers a few of the reasons why this works.
Edit: I realized that I didn't respond to your question of whether this demonstrates an improvement in Camden. Citylab seems to think so, but offers a nuanced explanation of why this may not be the case and what other factors are at play [3]
[1] https://www.sipri.org/commentary/topical-backgrounder/2019/p... [2]https://www.centreforpublicimpact.org/case-study/siezing-mom... [3] https://www.citylab.com/equity/2018/01/what-happened-to-crim...