No because Slavs aren't indigenous in Balkans, I2 was a haplogroups of thracians, illyrians, albanians. I2 isn't slavic marker:
"The high concentration of I2a1b-L621 in north-east Romania, Moldova and central Ukraine reminds of the maximum spread of the Cucuteni-Trypillian culture (4800-3000 BCE). No Y-DNA sample from this culture has been tested to date, but as it evolved as an offshoot from the Starčevo–Kőrös–Criş culture, it is likely that I2a was one of its main paternal lineages, and a founder effect could have increased considerably its frequency. The Cucuteni-Trypillian culture was the most advanced Neolithic culture in Europe before the Indo-European invasions in the Bronze Age and seems to have had intensive contacts with the Steppe culture before the expansion of Yamna to the Balkans and Central Europe (see histories of R1a and R1b). From 3500 BCE, at the onset of the Yamna period in the Pontic-Caspian Steppe, the Cucuteni-Trypillian people started expanding east into the steppe of what is now western Ukraine, leaving their towns (the largest in the world at the time), and adopting an increasingly nomadic lifestyle like their Yamna neighbours. It can easily be imagined that Cucuteni-Trypillian people became assimilated by the Yamna neighbours and that they spread as a minority lineage alongside haplogroups R1a and R1b as they advanced toward the Baltic with the Corded Ware expansion. Alternatively, I2-L621 lineages could have lived in relative isolation from the mainstream Proto-Indo-European society somewhere around Ukraine, Poland or Belarus, then as the centuries and millennia passed, would have blended with the predominantly R1a populations around them. The resulting amalgam would have become the ancestors of the Proto-Slavs."
https://www.eupedia.com/europe/Haplo...I2_Y-DNA.shtml
Slavs have settled to the Balkans in 7-8 century, but the I2 type was already here before them.
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