The original "single shock" (larger handles, concave analog stocks, weaker vibration) dual-analog pad was released alongside Tobal 2 in Japan. Tobal 2 wasn't technically the first game to support it, though, as a few games were pre-programmed to support it way before it was out. Rally Cross is the only one I remember offhand, but I know there were others. It was always a nice surprise finding the feature hidden in earlier games!
Regardless, I'm pretty sure that they're right about GT being the game released alongside (and the first to fully utilize, with different levels/types of vibration) the dual shock, at least in Japan.