Any why would there be? I assume the 100,000 figure came from Serbian sources who documented 70,000 refugees from Kosovo (and estimated 30,000 more went elsewhere or didn't register). Then they assumed that the 100,000 were replaced with Albanians unless there are other sources of documentation. But to simply point to lack of records in Germany and Italy is ridiculous. Did they document all the Jews and others that they killed?
The Albanians from Albania had no reason to move into Kosovo
They made it part of Greater Albania which could only be realized by military force and changing the majority from Serbian to Albanian which is what happened during WWII.
Neither the Germans nor the Italians had any reason to conceal administrative records with no link to any kind of criminal activity. .
There was no "greater Albanian" policy on the part of the Italians, other than the annexation to Albania of southern Kosovo and Western Macedonia, which had already a majority of Albanians.
And even less on the part of the the Germans, who kept northern Kosovo in Serbia, despite its majority Albanian population.
Neither had the means to impose a policy of massive resettlement on the recalcitrant Albanians during a world war, neither had any reason to engage in one and there is no contrary historical evidence whatsoever.
You have been repeating a Serb lie and, like most Serbs, without even knowing it was one. And now you engage in fantasy, with even less plausibility, to rationalize your gullibility.
Whether you accept it or not, 60 percent what the Serbs say about Balkan history is false, and the proportion rises to 90 percent when the issue is Kosovo. That is, three times the level of mendacity of the Albanians or, for that matter, of the Croats. You can't be "even-handed" if you don't take those proportions into account but of course you can only evaluate them after studying the subject seriously.