Indeed, the lifetime sales of the PS2 were 155 million, which would take 147 years to produce at this rate. But the "graphical version" of the article that it links to says instead the following:

> In this area of 31.4 meters by 6 meters, it takes just 30 seconds for a team of 32 robots to build a PS4.

So presumably there is more than one PS4 going through the pipeline at once for more than 1 per 30 seconds.