The article just claims "cheating". However, cheating happens in different situations. There is cheating on your friends or family or neighbours, and there is cheating on authorities.
In East Germany, the authorities were out to get you. Spying on you. Trying to catch you out. Your neighbours on the other hand were the people that you had to rely on and that had to rely on you. A person coming to you and asking questions was highly suspicious and probably up to no good. Everyone would lie to them. But not to your friends and neighbours.
That's probably still there, so if some scientists will come and ask questions, whatever the questions, nobody raised in East Germany will have any problem lying to them. Will they cheat to take advantage of their neighbours? I doubt it.