I'm interested in knowing how they came to these conclusion? Focus groups? User testing? They mention Google Analytics but that won't tell you that users are overwhelmed by the amount of text on your page.
We did not do focus groups, my experience is that focus groups can be hit or miss; They are also not really on the agenda for a lean startup.
I am sure that over the next few months we will continue to tweak our pages to help further tune our conversion ratios. -Brett