I’m sorry but this video is distoring the term epigenetics. Epigenetics is not a something that started happening in our era, it was simply something that was discovered recently.

Epigenetics is the study of changes in gene expression that occur without altering the DNA sequence. […] Epigenetics usually involves changes that persist through cell division, and affect the regulation of gene expression. Such effects on cellular and physiological traits may result from environmental factors, or be part of normal development. [wiki]