You may be correct in that the bulk of the market is in standard pizza & t-shirts, but the internet/computers didn't create that market.
The article was pointing out what ordering over the internet with computers can potentially add to the ordering experience. Using the "web" in the same way one might have used a fax machine isn't particularly interesting then or now.
It thinks that just offering a cart is a waste of the internet's potential rather than worth the billions that it is.