Umm.....as Kenny says it's all just numbers IF you don't record arrow weight, bow weight and drawlength. 5 - 6 gpp and as long a drawlength as you can muster is a good way to boost your sales figures....
The majority of people will just see the numbers and that's what this video is counting on.
400m - I doubt it very, very much. A 400m shot is not at all bad and would warrant the above data (arrow weight/bow weight/drawlength)to make it believable. The arrow appeared to be a plain non barrelled carbon shaft and that is what makes this smell a wee bit fishy.
I've just started to make some forms for glass Turkish bows, once I get them done i'll make a sales video like this one! Haha!