I remember when a mail merge literally meant printing out lots of address labels and then manually sticking them onto a letter & envelope. Word 2.0 (?) solved that problem for the 1990s and MailChimp has commodified it for the 21st century.
Double-entry book-keeping was technical work and was usually run by highly trained individuals. Nowadays every shop keeper just scans a barcode and has the customer tap-to-pay.
There's not yet a drag-and-drop like interface for anything more complex than Scratch (wither Visual Basic!) but the hard part isn't the technical work of stringing together libraries; it's requirements gathering.
Speaking of which, it has never been easier to drop in a high-quality cryptographic library, or import an interactive map on a website, or WYSIWYG edit a website.
So, the author is right that you can't stick a bored 18 year old in front of an IDE and have them create you an ERP. But a lot of the "grunt work" of IT is now firmly a commodity.