That's the thing about randomness and improvements to a RNG, it's hard to tell if it's being more random or not, because it's random lol. How I see it, improving something to be even more random wouldn't necessarily result in a better randomness than before. Increasing the amount of choices to have it pick from is one thing, but how it determines/chooses which choice is still going to be as random as always. I realize this statement might not make much sense, but it's how I've always viewed randomness of any kind. Although FF6's original RNG is pretty much non-existent from what I've heard, so any improvement to it is going to be better.
We are born, live, die and then do the same thing over again.