> "It surfaces content related to the node you're visiting using a lightweight fanout convention"
Requires knowledge of what exactly a "node" constitutes in this context. Since I don't know what such a node is, the remaining part of the sentence about the fanout convention is just meaningless (it also seems irrelevant?).
Now, it is explained on Agora what a node is, namely:
> "A node is the set of all subnodes with a given title, or otherwise mapping to a single entity or wikilink. Subnodes can come from a variety of sources; currently these are mostly notes as volunteered by users via their independent digital gardens."
This suffers from the same problems: I still don't know what a node is, since I would need to know what a subnode is. I'd expect a recursive relation where a subnode is simply a node that is a child of a node, but it seems there is a distinction between both. In any case, it's still unclear.
It seems as if it's written by someone who's so familiar with these concepts that they forgot what it's like to not have this background knowledge. I'd recommend letting someone without prior knowledge explain to you what they think it is in simple terms, and build your explanation from that.