All German MMC/SMC begin the scenario TI (A4.8). Such units remain TI until any German unit has LOS to a Known enemy unit, the instant any German unit is attacked, or at the beginning of Turn 3 (whichever comes first). TI German units automatically lose concealment when any Good Order enemy unit has LOS at ≤ 16 hex range. SW Recovery by TI units is NA.
I understand your concern with the Dummies. The question is if a Dummy has a LOS to an enemy unit does it simply disappear. I will try to reach Laurent Cunin, teh designer, but he gave up playing ASL some 20 years ago, so it may be a bit difficult.
As this SSR is written, I definitely agree that something needs to be clarified.