They complain there about proprietary javascript. The FSF has no beef with JS - it's just another kind of software. The FSF has a beef with proprietary software, which shouldn't be surprising. For analytics they use non-proprietary javascript (piwik). They elsewhere recommend precisely that, if you're going to be gathering analytics - they talk about their use of it here: https://www.fsf.org/about/free-software-foundation-privacy-p...