That is fair, to be quite honest. Even though I don't see JavaScript as some kind of threat, your point still stands. Note that leader does not disrespect user privacy in any way, and that it is open source, which means you could modify it to your liking. By this I also want to say that it does not include unnecessary code, and that everything dependant on JavaScript is there with a reason (to make the website functional).
What leader aims to do is to speed up and simplify the process of creating your very own simple blog, and I think it does a great job at that.
Since it does not require any kind of back-end processing, and is fully handled via front-end, I am unable to make it work without the use of JavaScript.
The only way would be to make it support static site generation.