I don’t know if I’m smart enough to explain or at least I have not spent the time enough to understand it exactly, but basically he has an idea that space (and all the stuff inside it) can be explained by a massive number of hyper graphs and their relationships. Here is a link: https://www.wolframphysics.org/technical-introduction/potential-relation-to-physics/the-structure-of-space/#p-410 So if I understand it correctly everything in the universe including space are just nodes and relationships between nodes, and there are simple rules that govern them, I don’t think they know what the rules are yet, actually there is an idea that it does not matter that the rules are as long as they are consistent. But anyway to make it work, you need a huge number of those notes, there are more nodes representing every single plank scale section of space that there are plank scale sections of space in the observable universe. It’s wild stuff. Lex Friedman has an interview about it here: https://youtu.be/4-SGpEInX_c