You have totally misread it.
It used to be that you had to prove you were innocent to get compensation. Now you don't have to prove that you are innocent, but you do have to prove that given the facts, there was no chance of a jury convicting you (in other words, that the prosecution should never have been brought).
It is still grossly unfair, of course, but, whereas you seem to be under the impression that the Supreme Court decision made it even more unfair, it made it a teeny tiny bit less unfair.
But the judges in this appeal don't have to have thought "he really did it" as you say in the title to your question, they just have to think that there was a reasonable chance of him being convicted.