I, too, find that it only works at the LCD which poses a problem outside (i.e. you need a hood of some kind at the LCD if you want to use the expanded focus assist). Whilst on the subject of focus features that work/do not work, have you tried to check the distance meter against a tape measure. On my 160A, the distance reported by the camera one you set focus is overstated by 9 feet at around 50 feet and reporting error increases to where, it seemed one time to report 90 feet when the actual distance was only 70.
I find that the display will report 3-4ft or 1 meter focus but I will be on a wide angle shot and nothing closer that 30ft(~10m) is in my shot. I'd say it isn't accurate.