A mulcher would work much better than the "scratter" in your link. You can open it up, give a good clean with soap and water, sharpen the blades then discard the first bit you crush. It works really well as a cider mill and most people have one in the shed.
A wine press works well for cider, you may miss some of the juice but they are easy to use. New they are very expensive but if you can get a cheap one go for it, just don't try that scratter, it looks very unsafe.