Re what Alice is quoting, you have to remember that the MiG pilot is talking about quite a long time ago, also.
About the radar, as it has been explained, the radar screen shows the vertical position of the aircraft in relation to the glideslope, but it does not show the exact value for height. What can be read from the screen is whether the aircraft is within a certain acceptable height range. While distance from runway and lateral deviation is known precisely (presumably, as it is what the ATC quotes back at the pilot).