There is definitely a variety of opinions on the risks of glyphosate. Here is a thoughtful discussion of the science, albeit from 2019 https://sciencebasedmedicine.org/update-on-glyphosate/

Bottom line is I'd be wary of taking a single person's opinion as gospel without looking at the entirety of the literature.

Dr. Seneff also, in the lecture, has research on mechanistic properties of duterium in the body, and a possible link to cancer (that needs research). https://stephanieseneff.net/category/deuterium/

new field of deutenomics (the science of deuterium metabolism in the body).

deuterium is universally present in water in small amounts, and that the mitochondria (energy-producing organelles in the cells) are highly skilled in pumping protons selectively (avoiding deuterons) into the intermembrane space, to metaphorically “charge up the battery.” (Protons are positively charged hydrogen atoms and deuterons are positively charged deuterium atoms). The reason the mitochondria obsess on delivering protons rather than deuterons is because deuterons gum up the engine of the ATPase pumps in the membrane, that produce the ATP. If they get overloaded with deuterium, these pumps break, the mitochondria become inefficent at producing ATP, and they spew out toxic reactive oxygen species at high levels. This causes mitochondrial disease, which is a hallmark of many chronic neurological, metabolic and oncological diseases.

glyphosate (the active ingredient in the herbicide Roundup) and deuterium are synergistically toxic.