Thanks for your insightful comment. Lord Colin Renfrew https://www.jesus.cam.ac.uk/people/lord-colin-renfrew-scd-fba explained that what is new is the use of ancient DNA.
He says the recent work of geneticist David Reich https://www.harvardmagazine.com/2022/06/feature-ancient-dna supports Gimbutas’ Kurgan theory.
You may enjoy this July-August 2022 article: Telling Humanity’s Story through DN https://www.harvardmagazine.com/2022/06/feature-ancient-dna : Geneticist David Reich rewrites the ancient human past.