The article appears to have been written in 2018, and just published recently. From the Discussion section:

> SciPy has a strong developer community and a massive user base. GitHub traffic metrics report roughly 20,000 unique visitors to the source website between 14 May 2018 and 27 May 2018 (near the time of writing)

SciPy 1.0 was released towards the end of 2017, so that timing makes sense for a 1.0 retrospective. Not sure why it took so long to get published.