This only counts for public sites with semi-static information.. I've been on plenty of internal/LOB projects where the filtering/searching/slicing of data and exporting to various formats are one of the core features of the application, where the data will also be different as time marches forward (non-static sites). Thousands of non-tech people rely on those kinds of features to do their job.
Oh, and some of them are behind firewalls/proxies/vpn and never see the light of day on the public internet, so no search crawlers can see them - and even if they could, they are not optimized for crawlers and/or too dynamic.
Well they said in the very first sentence it only applies if you're indexed by search bots. Internal apps (typically) aren't accessible at all, and quickly-changing data isn't indexed in time to be relevant.
