Was the decision to take the HIT a good one or a bad one if a blackjack player has 19, takes a HIT and gets a 2 for 21?

Well the problem is in your question.

the question was, was this a good decision or not, of course it was a good decision because he won.

in the reason you gave as a bad decision you give a lot more detail about what you are looking for. so with the extra information. of long term i would have said no because of the probibilities.