1. This is an article on "technologynetworks.com", if that's where you expect to get valid science reporting...

The original paper is titled: "Transgenerational transmission of hedonic behaviors and metabolic phenotypes induced by maternal overnutrition"

"Overnutrition", not high fat, which brings us to #2:

When they say High Fat Diet in these papers, they don't mean Keto or Atkins or anything like that. They mean: "fat mice", "overfed mice" etc.