My guess is that they do not. Simply put, they don’t have the manpower.
My guess is, they pull an answer at random from all the answers they received by the cut-off date and keep pulling answers until they get a correct one. Why would they need to read each answer from the pile and put them in two piles (correct and wrong) and then draw from the entire pile of correct answers as their form response says.
The reason why I say this is because for one of those math puzzles, you know the kind where you need to arrange a sequence of digits and put in operators of your own choice to come up with the right answer. I came up with a correct answer different than what they announced on the air and yes I double checked my work. I submitted this answer twice, and I was never acknolwedged.
So, for that to happen, they would never have read my entry. Otherwise they would have said on the air “Well Tigerboy and a few others came up with this alternate answer which is also right. Thank you”.