I have to say this however....the history of HOMOSEXUALITY is a European/Asian thang. Going allllllll the way back before African contact. So ummmmm this current science is NOT sounding convincing to me in the least unless homeboy can EXPLAIN the history of homosexuality in Greece, Rome and the Middle East...thousands of years prior to the industrial age. I'm just sayin. But! .
I don't think he is making any direct claims about homosexuality one way or the other, [though I may needs to view the second video and other of his], but is trying to explain the hormonal and gene altering effects of such chemicals.
It has been mentioned how much of these chemicals are found in the water that people in Uganda drink, use to cook with and bath in, and coincidentally, Uganda is an African country that is now experiencing what seems to be a surge in homosexuality.