If you can summarizes the arguments and methodology here it would be helpfull.
Of course if it is a work associated with a peer reviewed paper, the link to it will be helpfull (I'm too lazy, and not carring at that point, to look for it right now).
Mainly, how does he handle the Greek diversity ? Did he at least adressed it ? If not, it is a big flaw in his conclusion, as it is the main issue yet for a Slavic origin.
A key question is also to look at when, and with which dataset he estimated diversity.
Thus, maybe the guy did his job, and likely he did it well, but here is not the question.
A discussion should always be about the arguments. Many published paper with outdated data are just arriving to conclusion that we know can easily identify as incorrect. That's why science is not done in a "fix" setting, but that arguments always need to be discussed and re-assessed .
Anyway, just as a comment, the way you present this is an "authority argument". You don't provide the elements to reach a conclusion, you provide a "name" and hiis "conclusion" (without even a link presenting the concerned work). It is not a valid scientific demonstration.
I'm not saying this guy is wrong or right, but i want to see the arguments ;) .
PS : for the discussion, here is my own diversity map build using FTDNA data (it has been build over a 200 years time window after TMRCA ... I don't explain methodology in details unless some questions will be asked, because likely people here don't really care) :
https://i.postimg.cc/qRKMBCFb/map-di...120-dt-200.png
I think you speak of the Patterson et al. 2021 sample ?
We can agree that it is misdated looking at its mtDNA, there is no point to bring back this sample in the discussion.
This is a long shot.
I explain: when you sample a population, this population have a given diversity, let assume you want to sample a population with ~100 different haplogroups ... if you just take ~10 samples there is no way you'll probe all the diversity, even if you take ~100 samples.
Therefore, when an haplogroup is not found somewhere, the correct and scientific way of speaking of its absence is by :
1- Quoting its presence in a completely unrelated cultural and geographical context (yet there is no ~2000 ybp Y3120 ancient samples).
2- Giving an exclusion level at which we can exclude it a given location (not even from a culture, just from a given location)
For instance, let assume an haplogroup carried by ~5% of a given population.
How many sample do you need to expect to see one ? Obvious answear : ~20 samples.
But then you have statistical fluctuations, meaning that after finding 20 undependent samples you might be lucky and have several of those guys, or unlucky and have none of them.
To be able to claim a 3-sigma exclusion of the presence of an haplogroup (with a 5% occurance) you need roughly ~150 uncorrelated samples at a given location.
We are very far from such statistical depth (I know it is not easy to understand for people not habituated to play with undersampled data).
Ancient DNA have not the statistical depth to probe rare clades, for rare clades it rely on luck.
I2 is mainly paleolithic lineage, we know I2-P37 family is all over south Europe, this lineage is carried by surviving branches that got incorporated in susequent cultures.
There is no reasons to think that such process didn't hapened in the Balkans, we have not enough sample to say so.
It would be an amazing surprises if there is no I2 and no G2a in EIA Balkans (at least, ancient DNA is not even close to be able to prove such thing, if we stay on a scientific discussion).
The Adriatic coast in western Balkan seems to be J-L283 dominated, what is the status of more inland populations ? We don't know yet.
reasoning by saying "Itested culture X at one location then all location are likely the same." is very dangerous. Just look at IE cultures ... playing that game you'll conclude that R1b is the IE tracers if you just look western Europe, or that it is R1a if you look in the East. And then, we see that these culture have a diversity older than the beginning of their cultures.
And nearly all culture where the same, they were having a mix of very diverse haplogroups.
There is a lot of Balkanic old samples for I2a ... under I-P37 in northern Balkan by 3000 BCE. Not really a bet when you have samples.
There is also M223 branche well documented in the lower Danube bassin.