Whether the speed of light can only be measured at the observer's place, in his local inertial frame of reference, that is, where the measurement is made. It is about the fact that the observer (that is, his measuring devices) are in his local reference frame, but he is measuring the speed of light in some distant reference frame.
If this is possible, will there be a difference in the speed of light between a local and such a remote measurement of the speed of light, and in what examples?