I thought about that too. The people around Carpathian Mountains had a habit of playing hide-n-seek with invaders all the time, it's too tempting to think that

I thought about that too. The people around Carpathian Mountains had a habit of playing hide-n-seek with invaders all the time, it's too tempting to think that they somehow haven't learned to do this just recently. But then there was this Kurgan culture invasion that was very prominent, with clear signs of its occurrence (ending the Cucuteni–Trypillian culture, BTW), whereas the house burning were a recurring event long before that with no clues of a possible conflict. And it's also unlikely that after fleeing from an invasion they would return to the same place and just continuing their peaceful life, and this whole process happening over and over without mistakes.