No. A tipping point state is a state that will decide the election in the event of a close race. So, if, for example, the night is neck and neck, the tipping point is the state that is most likely to give H or T the edge and push them over 270 electoral votes based on that model. In that map, it's PA, which means that PA is most likely to push Hillary over 270 electoral votes with the current polling.
I guess another way to put it is that PA is the state that is looking the least good for Clinton and Trump that either of them would need to win in order to have 270 electoral votes and win the election. Note that looking the least good, in this case, means an 88 percent forecasted chance for Clinton to win the state.
Another way to look at it is that Trump would have to win all the states to the right of the tipping point and PA in order to have the easiest path to win the electoral college on election night. That means he'd have to fight through all that blue and win PA in order to secure the presidency at this point.
You can read more at:
http://fivethirtyeight.com/features...ethirtyeights-2016-general-election-forecast/ (scroll down to the tipping points section)