Can you provide some references to that effect published in the last decade? I specify the time period because historical genetics has shown that the cultural diffusion pots not people model promulgated after WWII is less accurate than the early twentieth century war and population replacement one.

I’m by no means an expert on the transition from the Stone Age to the Bronze Age but revolutions in military technology like the chariot or iron weapons did lead to rapid expansion of the culture/ethnos that had them first. The pre-Celtic Irish population left a comparatively minor genetic impact on the current Irish for example.