A preliminary injunction is considered very strong. So it's not that "nothing is final here", it's actually almost pretty much final unless something comes out of left field.
The injunction was to stop LinkedIn from blocking access while the case is ongoing, not to stop them from arguing that hiQ violated the CFAA. The trial court could hear the arguments and say "hiQ is wrong, they did violate the CFAA". Maybe that's not likely, but it also is not yet decided.
So what exactly did I misunderstand and why do you think this is final?
The 9th circuit uses a sliding-scale version of the preliminary injunction test. Because hiQ has more at stake, all hiQ needs is a serious question in this case, not a likelyhood of success on the merits.
It still might be case that hiQ has less than a 50% chance of winning in the eyes of the appeals court.
So what exactly did I misunderstand and why do you think this is final?