I didn't read this study, but I can't help but comment that past studies on this topic are of dubious quality https://en.wikipedia.org/wiki/Transgenerational_trauma#Criti... so very likely this is nonsense too.

I think the main problem is that something like "science proves generational trauma is real" is a nice headline, so people p-hack it into existence. "Science proves that generational trauma is not real" is just a null hypothesis being confirmed - not a publishable result and nobody cares, so you'll never hear about it. So be very skeptical of nice headlines, especially in university press releases!