I have to go radio silent now on my training and updates, with another contestant here!
You're right, though, the rules all specify the yard-line the kick is attempted from, not the length of the field goal. But all of the promotional stuff for the contest states it's a 40-yard field goal. If a FBG wins the preliminary contest, we need a FBG lawyer to make sure this is from the 30 yard-line.
For the preliminary contest, it says we start with a kick from the 25, so that's a 35 yarder. No way more than 5 people (of the 61) people off the street make that in one try. So it's going to be a quick session that day.
All participants get an Eagles gift bag worth approx. $200, just for being a daily winner, so that's something.