Author's presentation on the topic: https://github.com/TheOfficialFloW/Presentations/blob/master... (video not yet available)

Public reimplementation: https://github.com/sleirsgoevy/bd-jb (not a "full" jailbreak yet, the kernel part is missing)

To clarify, this exploit only works up to firmware 9.04 on the PS4 and up to 4.51 on the PS5.