I have a friend who kicked at Blinn College (it's a juco in texas) and he could kick 70 yard fg's like this with no problem. Not 77, but I've watched him hit 72 yarders. And every Kickoff was out of the end zone.. But in games it was a whole different story, he was solid at best. If you ever goto an NFL game and watch the kickers ( I know you wouldn't Hos! lol) they kick fgs before the game of crazy distances all the time. With no pass rush it's almost the same as just doing a kickoff.
Also wanted to point out this tape isn't running the whole time. You can tell they edited it between kicks. He may have kicked 50 times and they showed 8 of those.