Playtest made no sense
Why does the phone call kill him? Was it the electrical interference from the phone that caused some kind of malfunction? If this is the case, then nothing that happened in this episode after getting the chip implanted actually mattered. Because of this, we know almost nothing about the game, the AI, the intentions of the employees, etc since none of that actually occurred.
So this brings me to the next point...whether or not you believe that the game and AI actually worked as described from the simulated employees...why and how did the game's AI go rogue and kill him in 0.04 seconds? At first I thought that the game's AI had used the phone to escape the confines of it's programming by accessing the internet, but there is no *absolutely* indication that this was the case.
You could say he died from a broken heart or something, I refuse to believe this because the simulation only lasted 0.04 seconds (which is also very hard to believe, but I won't go there) Even if the simulation *subjectively* lasted for days, your physical body cannot possibly be affected to such a degree that simulated terror/hopelessness/etc could cause you to die in a few milliseconds.