Welcome to the 21st century, take a seat

If you really wanna know, he concludes that yes, and he'ss very adamant about it. However, given that he's a vegan, he might just be advertising for himself.
You'd probably have to give it a try to compare your results to his.

Is he allowed to eat semen if he’s vegan?

Meh I don't know maybe he edited out the part where the vegan police came to arrest him.