Not New News
I was taught this as an established scientific theory before 1981.
My school teacher even gave us the name of a scientist who had calculated the periodicity of the 'bounce'.
Not new news.
I have a theory - scientists rehash old theories for a new generation of public who missed them the first time around. A bit like Disney re-releasing their cartoons every seven years for a new generation of children to go and watch. It is easier than creating something ground breaking - just go search through the old dusty PhD theses and not even botyher to see if it has been reported in the news last time?