Because it got 7/10 average review scores and didn’t sell as well as GTA. Then GTA3 (and its immediate spin-offs and eventual sequels) came out and started breaking all time sales records. So retroactively, GTA 2 was “a mistake” for not being GTA 3 two years early.
But like the guy says, the point of the article even, is that you don’t create run away successes without experimenting on the formula to find what’s good, without “failures” like GTA 2 to learn from.
Damn, what a concept: doing the same kind of game multiple times, iterating on the design to perfect it. Obviously Bethesda gets releasing the same game over and over again, but this idea of “improving” the design is so alien to them. Wouldn’t adding thousands of microtransactions be an improvement?