Not sure what that has to do with anything. We're not talking about current populations of red and blue states, otherwise that would have been one of the metrics. As quoted from the article you posted, "Some states are putting out the welcome mat to attract the biggest, happiest, and most diverse workforce." That statement implies that they're talking about states attracting new people to move there.
So apparently, if you already live in a desirable state, you
cannot be counted?
The list is the best and worst states
to live and work in, NOT the best and worst states
to move to. The existing people who already
live and work in a state most certainly count as people who have chosen that state
to live and work in.