Coauthor here. As it turns out, this is one of three papers released near-simultaneously that uncover the extent of tracking on TVs or IoT devices more generally. I've written up a survey of the three papers and what I thought were especially interesting findings, along with some thoughts on why targeted advertising as a business model for TV platforms is harmful to users: https://twitter.com/random_walker/status/1177570679232876544
Direct links to the other two papers:
https://moniotrlab.ccis.neu.edu/wp-content/uploads/2019/09/r...