Yeah, that was my reaction as well. I fully understand his point regarding ORMs that are meant to be an abstraction over a relational database, but imposing the relational model over non-relational datastores sounds like a disaster.
If only there was a popular example of this. Wait there is: PostgreSQL.
They bastardised SQL to support JSON data types just like every other vendor has to do because SQL is for relational and only relational data stores. Is this the utopia that the author is after ?