Yes, but as Z states, it may was influenced further by something else. Its not pure, ancestral Illyrian. A small element of Romanisms, Slavisms, Turkisms, ? some other elements, have been introduced.  

 As for genetic studies, I too have realized that we cannot make conclusions from them,. There is no "Slavic" vs "Illyrian" gene. Much of the conclusions stem from making assumptions about biological and molecular behavious, and assumptions about modern populations serving as proxy representative for ancient ones. Eg Basques = Palaeolithic hunter-gatherers, Turks= Anatolian farmer migrants of the Neolithic, Ukrainians= are of Proto-I-E urhemeit, as well as Slavic 'homeland'. Obviously some have challenged such assumptions. Z quoted the percentage based on Y-chromosome haplgrups. They are a good signature of past migrations. However, they are prone to drift and only tell part of the picture. Nevertheless, other types of DNA studies have also been perfored, using autosomal loci. These show that SOuth SLavs, eg, cluster partticularly with Romanians, Hungarian, northern Greeks, suggesting that they have a common ancient biological origin, although we cannot discount the similarity to other factors such as massive Slav migrations in historic times, which affected all the abovemention areas. However, yes, as pointed out, Goths, Slavs, Huns, etc were all heterogeneous. People needed not be biologically Goths, but just willing to act like one and beleive that they were a Goth.