The speaker says that a reward function can technically be defined for almost anything, and that it will somehow figure it out.

“Okay, if it's a radioactive low dimension you can solve it by hand. Even if it's really really high dimensional, like the the actual problem behind is really really high dimensional, really complex. So in that sense, if the the idea of like the reward being enough is completely true. Uh technically it is like technically you can define”

“reward function for pretty much anything it will somehow figure it out”