> Inertia causes the sensor in the accelerometer to read nonzero.
This can't be right, because an object moving solely under gravity is moving solely under its own inertia, but an accelerometer attached to it reads zero.
> do the experiment!
Do what experiment? Experiments showing that accelerometers attached to objects moving solely under gravity read zero, while objects subjected to non-gravitational forces read nonzero, have been done.
Meta: let's stop arguing what might happen, and do the experiment!