Many points by NIE were made with the black side and not with the LP at all. So it just frustration over not knowing how to play.
i think it is very bold to say that such a high level player like andreas should simply "learn the game" (against pips-out or whatever).
Nie does not need to score the points with his LP side, if he simply forces Levenenko to loop a ball too high with it, so that he can finish it with a smash of his regular rubber.
I don't want to drift into the conspiracy mode here, but it is very well known that sport associations and tournament organizers will not have anything to gain if they disqualify a player due to his equipment. In the end they planned for this player to participate and if they disqualify him who is going to replace him ? i would say the racket control people are not really inclined to be very picky.
There are rules that are simply not enforced. I probably have seen hundreds of wrong throw-ins in the german bundesliga (soccer) where any lowest league player could point out the rules and tell whats wrong, but i guess the referees don't want to embarass the players in the highest league not being able or willing to do such a trivial thing properly.
It might be similar for racket control. additionally it is of course difficult for Levenenko to exercise against such material, because there are so many different pips-out rubbers that behave differently (propably varying more in behaviour than the pips-in rubbers).
To reduce all this talk and arguments, the loser should have the ability to challenge the validity of the opponents blade and get to wittness the tools for checking friction and size be used infront of his own eyes. This way the competition still has this match be played and if player with a possibly "bad" rubber has something to lose.