You may not want to believe it, but it is 7.3 fps, and to me it looks like it.
If it looks like 7.3 fps to you, I suggest you have your eyes checked.
If Quicktime-player says it is 7.3 fps, it is wrong. I took your advice and checked with that player and it actually says something about 7.3 fps but it is obviously wrong. Now it's your turn to try it my way and get a player where you can step forward frame by frame and count yourself how many times the screen moves every second in that movie. It won't be 7.3 fps, that's for sure.