Funnily enough, the blog post itself has a counterexample in their singular noun example: the table^Wrelation name is `user` which is highlighted by the syntax highlighter as being a keyword. I'd wager the same thing would happen for a table named, say, `transaction`.

Some DB engines won't let you use a keyword as identifiers for anything unless it's quoted, and then you either have to quote everything, or end up in a weird situation where some things are quoted and some aren't.