If you play on Lotto and play one billion lines, each one different than the other one, would your chances be higher than if you played only one line?
I'm not sure it says any universe is improbable, only that it's improbable to be the way ours is. It could have been many different ways but none of them would have been stable or such. Personally, I think they're wrong (yes, I sometimes think scientists are wrong
).
Well, I've seen many different attempts of calculating the probability of the universe we have but they all are made from assumptions and our limited knowledge of how the universe works. We still don't have an explanation for dark matter, dark energy, or full understanding gravity, and more. So to calculate any probability without the full knowledge is a shot in the dark.