It sounds like it used to exist. No longer exists and is now coming back. If it was currently in existence it would say modified.

No, it means that the boards have their power stripped until their membership is replaced by the new, captive appointees that can be relied on to not be independent of the agency they are notionally overseeing, at which point their powers are restored.

That's what “required to be re-established” means.

Re-established in this case means, dissolve the existing boards and reconstitute them with the appointees. Review boards already exist in Florida.

No. My city has an independent citizen review board. This law means "yours will be dissolved and we will make anew one appointed by cops."

Well, regardless of what it sounds like, they do exist. The wannabe autocrat is weakening them.