Pretty interesting that the author was upset someone said SQL = Schema and NoSQL = No Schema. It's usually pretty clear that the no schema part is usually in reference to no certainty in the schema of the data. Or I guess one could model it as a spectrum of certainty.

Actually now mulling over it some more, I see their point. It's just that their consideration of schema is more holistic than typical. I find people tend to use "schema" to refer to what's in the database, while in code people refer to it as a "model", and that a schema is just an implementation detail of a model.