Bollocks
"First, the environment needs to be open-ended enough because the agent's capability will ultimately be upper-bounded by the environment complexity," said Fan. "And the planet Earth we live on is a perfect example, because Earth is so complex that it allows an algorithm called natural evolution over billions of years to create all the humans in this room."
There are two core problems with this statement, [1] the Earth is a closed system, albeit with energy fed from outside, not open-ended at all; [2] natural evolution is not an algorithm -- it's an outcome of multiple independent processes.
It would be really great if public pronouncements (particularly those made by leading technocrats) were more often based on real knowledge in the areas they discuss. Then the myth that everything can be computerised (just like the 19th century myth that everything could be driven by, first, steam, and then electricity) would at last be recognised as just that -- a myth. There's an old Dilbert cartoon in which D states that there's an engineering solution to every problem. As an engineer, I can categorically state that he was wrong -- a huge array of human/social problems can not be overcome by engineering, they can only be buried from view by it while persisting (or indeed escalating).