Take your disagreement up with kenn then, don't change his argument. High quality single player games absolutely do not take that long. A few might, like Rockstar games where they have a near endless supply on money to make them, but most AAA, quality single player games (hell, even multiplayer) have a development cycle that's nowhere near that long.
TLOU 2 - 3 year development cycle
GoW 2018 - 5 years
Halo 5 - 3 years
Witcher 3 - 3.5 years
Those are just a few examples, and I can dig up TONS more. It's still an entirely made up statistic that cherry picks only a few games to use as an example to fit his argument, regardless of if there's any truth to it.