I have to fight the urge to be the "someone is wrong on the internet" guy in the XKCD cartoon when I read stuff like this. I don't think it's being overly pedantic to say that words have meanings, and that meanings are especially important in relational database theory because they are precise mathematical meanings--not fuzzy natural language meanings.

From that perspective this document is borderline incoherent. The authors don't know what a relational database is.