Yet, perhaps surprisingly, they seem to have exercised little control over events.
Why "surprisingly"? Libya was Italian sovereign territory, not German, so German officials stationed there, whether civilian or military, had no power to tell the Italians what they should or should not do.
If this Bernhard person did not realise that the Germans did not have any political or administrative power in Italian sovereign territory, then he is not much of a researcher, despite what Urmel thinks, and indeed is profoundly ignorant.
By giving carte blanche to the Italians, Rommel implicitly condoned, and perhaps even encouraged, their war crimes.
Again this is absolute rubbish, for the same reason. In Libya, Rommel was merely a military commander, and had no authority whatever to either prevent the Italian administration from doing something or give them "carte blanche" to do something. Even as a military commander he was subject to the Italian Comando Supremo in Rome, not to the German High Command, or even to Hitler. For example, when he wanted to invade Egypt after the surrender of Tobruk in the middle of 1942, rather than invading Malta which is what Hitler wanted, it was to Mussolini that he applied for authorisation to do so.
This Bernhard person also says something extremely stupid at the end of his article. He claims that the British and Dutch were more virtuous as colonial administrators than the Italians because, although they could sometimes treat the native populations they ruled over rather harshly, they never persecuted the Jews living in their colonial possessions whereas the Italians did.
That is nonsense because it ignores the essential reason why the British and Dutch did not persecute the Jews living in their colonies, which was that the Jews supported the allies and did not oppose the colonial rulers, unlike the non-Jewish natives who often did oppose them, sometimes rising in rebellion. By contrast, the Jews in Libya did oppose their Italian rulers and did collaborate with the British forces on the two occasions when they briefly occupied Cyrenaica, and that is the reason why the Italian authorities treated them harshly and sent many of them to internment camps.
Furthermore, what Bernhard claims is not entirely correct. At the end of the war, parts of the Jewish settler population in Palestine did rise in revolt against the British administration, and the British did crack down very hard on the insurgents, imprisoning many of them and even executing a few.