The name on thesis is "THE GENETIC MAKEUP AND SOCIAL ORGANISATION IN EARLY MEDIEVAL COASTAL SOUTHWEST FINLAND", the author Nelli-Johanna Saari. It is available from the library of the University of Helsinki. I do not quote it because it is limited by copyright laws, but you can order it by email, the Openness Act gives you right to get it.
The main discourse of the thesis is related with archaeological finds. It is good work as far as I can understand, keeping in mind that I have not got acquainted with archaeology more than reading some books published for laymen. The text was interesting.
Coming to the part dealing genetics I can say more. This section is rather brief, but earns to be noticed because this is the first one giving something of the thema i.e. Late Iron Age Finnish genetics (in Finland the Iron Age ended 1200AD! and historic time from that onwards).
The thesis includes two PCA plots. These plots prove only that already 1000 years ago the Finns were Finns. Only addition that can be said is that they might have carried less Saami or Siberian admixture than Finns today, but too few Saami samples on the plot didn't reveal the possibility of Saami admixture in Iron Age samples. It is also possible that some samples represent Iron Age outliers, samples seen outliers from the present-day perspective.
The admixture analysis shows same tendencies than PCA plots.
The f3-analysis uses homozygous western hunter-gatheters as an ancestral source, which can lead to erroneous conclusions, because thousands years old ancestry comes through a complex history from different eras and directions.