Ye, but I think Hennessey did rebuild one of them later, so it could count as maybe 2019, but it's still not made by dodge, I mean you can create a car and tune a car (and eventually destroy it), so you're right with the end of production by dodge
The Viper in that game was a 2013 model which was revealed in 2012. It also was a free DLC in Forza Motorsport 4 that was brought to the game in July of 2012.