The website is not particularly well designed. I have to scroll down a 2/3 of the whole page filling _button_ first, to get to any readable content. Perhaps that is why it is treated as spam to Google. Reader mode in Firefox helps of course to repair the page.

Aside from that, yes, this is what happens, when we rely on Google traffic. Only advice I can give besides designing well (not necessarily according to Google wishes though), is to not get too dependent on Google.