All along I had thought that "AGI", "RSI", etc. were at the model level: but this paper seems to be talking about "agents", etc. I'm not sure having a swarm of agents explore a problem space in parallel via brute force is what "AGI" is about. I'd be happy to be proven wrong.
AGI and RSI are both meaningless terms, meaning whatever you choose them to mean.
RSI is the new sexy. Models are RSI-ing themselves towards the singularity, these folks' agents are RSI-ing themselves towards mastery of their training environments, and my pet cat is RSI-ing himself into the best cat that he can be.