I'm pretty inclined to agree with this. I strongly disagree with the view on history that focuses on individual figures in general; I think that the contributions of all people matter and when we focus too much on "great" individuals it reinforces the idea that some people are more valuable or just "better" than other which is what our modern hierarchies and even ideologies like fascism are based around.
In this case, I wanted to focus on Jesus as a symbol, since I think people are more used to thinking in that way. I'm very interested in Rav Hillel and will spend some time researching him for my own interest, but I don't know how many people have his picture on their wall or wear bracelets reminding them to act more like him. Jesus is just a very easy vector for spreading ideas and sparking discussion for a large number of people. I'm hoping that was the point this article made, rather than anything about Jesus being the primordial originator of nonviolence or anything.