Yes, the author is likely unaware of this. They see markdown files with links, so a graph and the set of those files, so a "database".
https://neo4j.com/docs/graph-data-science/current/algorithms...
His argument is that the LLM is the query engine. By that logic you can approximate anything since LLMs can.
Neo4j looooooves the "if you think about it, everything is graphs!" marketing maneuver. They (their marketing department) were the very first thing I thought of when I read this headline.