Well, ChatGPT knows about the 90s Balkan wars, a topic to which LWT hasn't made an episode that I'm aware of, and yet I can ask it to write a script for a Balkan wars episode that reads surprisingly like John Oliver while being reasonably correct.
Essentially Carmack pointed in the slides that teaching AI to play game a, b or c didn't improve AI at all at learning game d from scratch.
That's essentially what we're looking for when we talk about general intelligence, the capability to adapting what we know to what we know nothing about.
Doesn't the article states that this is not true? AI cannot apply to B what it learned about A.