Sorry that is just bunk. It is no different than to say that riding on level ground at constant speed you are always accelerating because you are overcoming the forces exerted on you by rolling and air/wind resistance and the force of gravity which is still acting on you but at a 90 degree angle. You are required to add energy to maintain momentum in all of these cases to achieve constant speed, but as long as you are at constant speed no matter it gravity, friction, or nuclear forces that you overcoming you are not accelerating.
The Gravitational Acceleration Constant is only good in an ideal frictionless system, in real life the countering forces of air friction increase proportionally to speed until the GAC is overcome and acceleration ceases and you fall at a constant velocity with a certain momentum. This is physics 101.