Ventris' mid-20th c discovery that Linear B records 'archaic' Greek pretty much nailed it down.
I agree
But another way we learned much the save information is is the spread of languages in how they developed from different civilizations geographically
To me the genealogical morphing of languages from one to another has been something I learned many years ago
Sinilar to this study you shared. However The DNA tracing is much much more convincing, yet it led to a similar result