Well, I haven't tried 39 different thermal compounds so I'm only going on what I've tried.
But yes, for that one chart the Liquid Ultra is the best, but the other charts give different pieces to the puzzle.
I think the first paragraph of the conclusion sums it up best: "In the end, it doesn't necessarily matter how much you paid for your paste, or what thermal conductivity its manufacturer claims on the package. More important is the how: your application method makes or breaks this process."