Your quote implies that the justices reviewed their record in the Grady 2 decision, compared it to the one they were hearing, and concluded that the state did not meet it’s burden of proof. Pretty simple.
That wasn’t the discussion, though. TS asked (forgive me for paraphrasing) “What’s next?” I offered my opinion that the state would appeal to NCSC and probably win (since most of the justices on NCSC appear to be vote-buying chicken-sh*ts like most of our legislators) and that a trip to SCOTUS could go any way, especially with Kennedy’s seat currently up for grabs.
Hope that clears it up.