You're quite right. I think my complaint was that it reduces the definition of "database" to "anything that is used to store data", rather than the database being the json file(s) themselves, at which point we have degenerated to about the same terminological point where it would be reasonable to call saving CSV or MS-Access files into a Dropbox folder "Dropbox-as-a-Database", which seems an unhelpful label, if nothing else.