I agree that the concept of intellectual property is quite problematic, especially in this field, but even without actively shutting down thousands of small farms with the tactics you mentioned, Monsanto would still have a MASSIVE share of the world's food supply due to the disproportionate amount of food produced by corporate factory farms.

Yes, smart people can totally get things wrong. If all that he was saying is "GMOs are safe & OK", that would be a case of just getting it wrong... However, the claim he makes (in this video and others) is that modern GE technology is functionally *no different* than selective breeding, which is absolutely not true, and something that one can really only get from listening to Monsanto's propaganda.