That game engine was over 3 decades ago! John is one of the sharpest minds I've ever seen, if he's passionate on AGI, he surely has much deeper understanding what he's doing than the AI trendies on social media.

Let me introduce you to the wonderful game that is The Talos Principle: https://en.wikipedia.org/wiki/The_Talos_Principle

It discusses whether it is possible to evolve AGi using... computer game engine! And that is John's bread and butter.