Woah, so many posts in 1 day over nothing.
Anyway, I did some research on the Atlantic admixture and since even Otzi had 25% of it, it wouldnt be unreasonable to assume that people from the same but more Southern mountain ranges (Dinaric Alps) wouldn't have it in similar levels. That said, Fatherland can be right in assuming that it's ancient.
On the other hand, I noticed that the North-Western admixture is the same for Albanians, South Slavs, and Romanians, and it actually increases in Northern Bosnia and Croatia.
That said, it doesn't seem to me as a recent North-Western input in Albanians. At best we can go on and speculate about Catalans and even that wouldnt make sense why its specifically higher in Ghegs, despite the lack of North Iberian haplogroups in general.
With regards to I2a-Din, I've mentioned before that Dacians and were recorded to have been pushed South-Westwards beyond the Danube and even resettled there. Then the Carpi and other Free Dacians made their incursions there, followed by additional waves of Goths. On top of that, Northern Illyria went also through demographic changes with many of its strongest tribes being utterly destroyed and resettled in Dacia after The Great Illyrian Revolt, as if those mountain ranges weren't already sparsely populated enough for a small intrusion of I2a-Din folks to make a difference.
Then the Slavs came and more and more people were pushed further South or isolated in the mountains just like the I2a-Din. And I insist on the fact that the I2a-Din majority area is historically known as heavily populated by Vlachs who were moved further West by the Ottomans and settled in Herzegovina, Bosnia, Dalmatia, Lika, Northern Montenegro, etc. I'll have to agree with the Slavic members that with the facts I have, I consider this haplogroup to be North-Eastern Balkan and not North-Eastern European.