The kids page does this - it sells his sponsorship needs really well.
Everything else is noise.
I cannot point to any research but I am pretty sure that a sales page that
has focus, one message, filters out its non-target audience and clearly and simply repeats its message
is better
than unfocused, off message, vague sales pages.
Whether they flow downwards or not is of secondary order.
That all said, I want to take anything away from this guy, he's done a fantastic job and deserves recognition.
My comment was more aimed at the OP's assertion that this sales page is "better" than other sales pages.
The Prey Project website (http://preyproject.com/), to me, is one of the best designed product pages I've seen. It uses the "boring" style, too..
I think the newer, 'trendy' flow pages tend to be marketing a solution to a problem you didn't know you had - stuff that's less defined than 'I need a dedicated server'. Perhaps you need to be won over to the idea that you need the product in the first place.
Before this growing style, white "clean" pages with minimal content was in style and is still in favor. Before then, extremely detailed "photoshopped" pages with a bunch of flash was in style (and menus, menus, menus). Before then, geocity and frontpage style, with blinking animations and sound. Before then, Spreadsheet style and link tables.
I wonder what this style should be called. I do like the name "flow style".
I would also say that if that page was any longer or any more information dense then it wouldn't work as a thing. It only works because there is so little content.
In general it depends what you're trying to sell. I've never actually purchased from one of these "flow" pages, but I have purchased a lot from more boring product pages like this:
http://www.linode.com/tour/
The OP's sales page is definitely in fashion right now, in fact it looks like every current startup's page. But just because it is in fashion doesn't mean it is actually effective, and I've seen no evidence (and the OP supplies none) that it causes higher conversions than a "boring" sales page.