What’s up with the Illinois “purge law”?

https://www.findlaw.com/legalblogs/legally-weird/no-there-is-no-purge-law-in-illinois/

Can someone explain to me what exactly this realistically entails for the general public? Are they really releasing dangerous people? Is it as serious as everyone thinks it is? I don’t want to give into media hype so I would like a realistic perspective on this matter.