The article talks about sending first-party analytics events to an analytics provider from your own servers. So the server-side tracking the article refers to i

The article talks about sending first-party analytics events to an analytics provider from your own servers. So the server-side tracking the article refers to is similar to the server-side tagging Google recently announced[1], not the analysis of server logs. [1] https://developers.google.com/tag-manager/serverside https://developers.google.com/tag-manager/serverside