No, of course I am sure that controller knew the right distance of LOM (6,26km). But I belive that his primary information was the distance. He had reported it in that moment when a/c blip crossed 6 km distance line on his radar screen. And the same for 4, 3 and 2km. Look at the graph, all this events lies on straight line (brown), the line of constant speed ca 290km/h. I suppose that this electronic generated distance scale on the screen of this mobile radar could be shifted by knob for compensation of the offset betveen THR and actual radar site. It could be set uncorectly or setting inadvertently changed. Or drifted as a result that out-of-date military radar (with his electron tubes, rusted contacts, elektrolytic capacitors etc.) was not used for long period.
I think that information about LOM was just to be sure. Both informations cannot be correct together (6km or approaching LOM).
Of cause it is only my speculation and nothing of it could dive a/c beneath MDH.