I do not think that is true. Studies before WW2 were showing that starvation of a mother affected subsequent metabolism of descendants. During WW2 Belgian famine, reduced caloric intake of the mother affected the body weight of the child into adulthood. It's interesting, if the starvation occurred during the first trimester or the third, the offspring ended up overweight or thin. The difference was about 20 pounds. There are many more studies.
The Dutch found a similar correlation: after the war, they noticed the population of Rotterdam exposed to the 1940 bombing had a statistically higher rate of heart attacks even after correcting for other factors. Then hey noticed their children did also.
well...mice don’t have a human will so there’s that.
I think what’s new is the identification of particular blood factors as a possible mechanism for how the defective stressed metabolism is passed on to the offspring.