Did you click on https://www.inventati.org/about ? (I also tried reading the manifesto first.)

From it:

> We support individuals, collectives, communities and groups whose political and social activities fit within this worldview and who share with us some fundamental principles: anti-fascism, anti-racism, anti-sexism, anti-militarism

I suspect they have some "not mainstream" political views; although I think understanding what these views are requires more in-depth reading of the blogs that they host.