I find it interesting that this article is published on a platform that makes uBlock block 27 requests and most certainly does contain non-free javascript. Richard Stallman talks a lot about how these thing inhibit freedom and that we should not support those companies. But when he publishes an article on ad blocking he does this on a platform that absolutely does not meet his standard on freedom.
The article can probably be viewed using LibreJS with GNU IceCat, that's the bar he uses for most websites (however he states that for GNU package hosting and things that the FSF supports, this bar is not high enough and outright denies any non-free JavaScript in those cases).