What makes you think it is 'his' work and not theirs? I remember when OpenAI was just a joke compared to Deepmind. The turning point (as I remember) was when they used [1] deep reinforcement learning on dota2. clearly iyla (also one of the authors) contributed, but so did many others on the team I assume?

[1]: https://arxiv.org/pdf/1912.06680.pdf