Did the dude say anything that people didn’t already know? What else is Sony going to care besides money?
If you want a game to be a success / have a sequel, well, yeah, buying at full price is the best single possible thing you can do.
It’s also probably the dumbest thing a customer can do, now that games apparently are better some months down the line, and discounts are frequent and oh yeah, there are more quality games than anyone has time for, not to mention that now games apparently should require hundreds of hours to finish / shouldn’t even be possible to finish.
Why the game didn’t sell well enough, dunno, but probably because zombies are kinda generic when compared to other stuff.