Well from my reading of the article it seems it was constructed by one of the first ever groups of people to come together to form a social unit, for the purposes of farming, as such a monument couldn't have been constructed by one man. The carvings on the monument depict an 'Eden like' environment, which they were obviously quite fond of, so by coming together as a group, to build this monument, while enaging in argriculture they destroyed what they worshipped, the Eden like landscape around them. So for them to build the monument the celebrate the landscape, they had to form a collective unit, which itself destroyed the landscape. Which you have to admit it beyond ironic