"The fold" is important in many places; games and other web applications should indeed be visible from the start. It's true, we have now scroll bars and scroll wheels and scroll areas on our touchpads, so it's not as important as it was in press, but it surely does need to be considered. It always upsets me to see news sites which have too much crap at the top of the screen getting between me and the thing I came there to read.
In this case, you are simply wrong about the application of "the fold", though. The point is, this is a simple web page containing a link and an application. The application is large enough that it cannot be reasonably guessed to live in the top 400-500 pixels of the screen. So there should have been a visual cue to distinguish the application, perhaps a box around it, so that people who have not yet seen the buttons at the bottom will scroll down and see them. Right now you have no idea where the application resides, and that is the complaint.
In this case, you are simply wrong about the application of "the fold", though. The point is, this is a simple web page containing a link and an application. The application is large enough that it cannot be reasonably guessed to live in the top 400-500 pixels of the screen. So there should have been a visual cue to distinguish the application, perhaps a box around it, so that people who have not yet seen the buttons at the bottom will scroll down and see them. Right now you have no idea where the application resides, and that is the complaint.