[eru]

If you want to be precise, it doesn't make sense to talk about _one_ shuffled or randomized deck.

Randomness strictly speaking only makes sense for distributions, not for particular instances.

If you have any probability distribution of permutations, then shuffling doesn't make it less random (ie doesn't decrease entropy), no matter how bad your shuffle is. As long as your shuffle does not depend on the state of the cards.

A random shuffle might, by chance, return a specific deck into a fully sorted state.