Because it doesn't matter in this context, because they were all coming down with Channelled Ware/Belegis II-Gava or later from Psenichevo-Basarabi. If they became Illyrian later, like the Dardanians, E-V13 came with Daco-Thracian tribes and speakers originally. Even most very Southern Albanian and Greek subclades have a TMRCA around the transitional period, some somewhat earlier, but that doesn't mean they were present earlier, which they were not. They all came down in the LBA-EIA and were, originally, speaking Daco-Thracian idioms. All later people from these formations, which were not assimilated by other groups, like the Illyrians which helped to form Dardanians when fleeing from other Illyrian tribes which pushed them - which is all attested archaeologically - were later Daco-Thracian speakers or in the borderzone.
The date of your TMRCA, of around 0-500 AD, like I wrote before, with midpoint around 200-300 AD, means we're still talking about Roman times, when the Empire was still alive and the province not overrun by Germanics, Slavs, Avars etc. Many of your neighbouring subclades are clearly Albanian, but we also don't know how they became Albanian. For example, they could have been Illyrianised Thracians from the Iron Age, or they could have become Albanian speakers very late, when Vlach clans assimilated into the Albanian community. We don't know without more modern samples and ancient DNA.
What matters most is when your direct paternal lineage had the last common ancestor with others. If you match other Vlachs and Serbs, but no Albanians, post 500-1.000 AD, your paternal ancestors might always been Vlachs. If you get Albanian matches after 500 AD, probably even in Medieval times, then your lineage was once Albanian, but turned Vlach. Its even possible they were Vlach, turned Albanian, then back Vlach again. That's of course not very likely, but possible, like there are many possibilities. But the most decisive step forward for you is to identify more recent paternal matches, this is what will tell you the most. And this needs unfortunately a lot of patience. In your case its particularly bitter, because you have a closer match, but he doesn't provide information to you.
Going deeper its easier to answer, because regardless of the ethnicity and language they later had, in the Early Iron Age, they were all Daco-Thracians and part of the Channelled Ware/Fluted Ware horizon in the Carpatho-Balkan sphere.
https://www.researchgate.net/profil...ith-the-most-important-sites-mentioned-in.png
https://www.researchgate.net/public...te_Bronze_Age_and_Early_Iron_Age_Transylvania
The movement to Albania and Greece came from this core regions, especially Belegis II-Gava:
https://imgur.com/fogur6Ehttps://imgur.com/fogur6E
https://www.austriaca.at/0xc1aa5576 0x002debf3.pdf
Moesians, Triballi, the substratum of the Dardanians, they all were part of the the same paternal expansion and later formed the local Roman population of the Balkans, as well as Vlachs, Albanians, Bulgarians and Serbs - in part respectively.
https://imgur.com/fogur6E