The site does refer to firmware 6.xx so abit confusedThat site seem very outdated.
Currently there's no working jailbreak for 6.xx availble to the public, however some exploit was discovered recently on all hardware revisions of the PS4 which requires some hardware modding or "chip" as per wololo.
--still early stages for this, I won't keep my hopes up yet for anything available to the public soon
Have you tried it?
What firmware are you running?