Sensing Orientation MPU-6050

Hello everyone,

I don't know if the MPU-6050 is the component attended to sensing orientation. For example if I hold my smartphone in the right direction of the reverse, this component is able to detect the orientation ?

The accelerometer in the MPU6050 is used to detect orientation, but only if it is held still while the measurement is taken.

I don't understand "only if it is held still while the measurement is taken." ?
What did it imply ?

The sensor cannot be moved while you are making a measurement, otherwise that measurement will be wrong.