I agree with the author. I understand many of the reasons others give here for why icons could be beneficial- localization, literacy, vision issues, etc. all are great reasons to supplement text with icons, theoretically. But I disagree that these icons, I mean those shown as examples in the Apple menu, Safari menu, or Google Docs menus- actually convey anything useful and really do prove the authors point that they’…
The function of the icon is to have distinct shape so you are able to visually distinguish menu items quickly in future (more you use the app).
There are other factors like consistent placement that can help. This icon approach is good especially if you have common shared menu items over the OS or they change their placement throughout the app.