What I meant with experimental cinema, were non-narrative avantgarde films. I know some of the listed titels contain experimental elements, and some even could be classified as avantgarde (e.g. "People on Sunday"), but I meant even more radical work. But maybe it isn't considered significant enough. 

For Kluge, we have the wonderful Edition Filmmuseum DVDs. A lot of his films got released there recently. Maybe Criterion will pick some of those for future releases?