No, you have a 1/2 chance of winning after a door has been opened. However, you also have a chance of losing on that reveal. Something you don't have in the normal variants. (That is, in normal variants, you only lose at the end of the game. This one, you could effectively lose when the host opens the actual winning door.)
So, your overall odds aren't as different as it seems. Just you have a much better odds of winning by switching, if you are still in the game.
So, your overall odds aren't as different as it seems. Just you have a much better odds of winning by switching, if you are still in the game.