Well I've watched like 5 minutes but getting the general idea of what he is saying he is right in the context of the belief system he has but I think he is wrong because of the belief system I have.
In the context of cruelty I don't believe there are any parasites for instance who would give a shit if they made you miserable and put you through years of a torturous existence even if they were as smart as us.
Animals are smarter than we give them credit for but what they don't have is our empathy for other species. Whilst for instance we can understand the pain of a pig being killed for food or treated cruelly in factory farms the pig wouldn't give a second thought to eating you alive in circumstances where you're incapacitated and unable to escape. Empathy is hardwired into us but so is reciprocity where we demand equal treatment to how we treat others, hence the reason for the 'golden rule' he headlines his talk with. If animals cannot empathise with humans then we can justify not empathising with animals.
He is very smart but the thing is smart people are extremely good at 'justification after the fact' which means having a point of view and then building up a sophisticated and powerful argument around it. I.E. reach the conclusion and work backwards, it's a powerful tool and funnily enough The Hobbit was created using this technique when the author wrote 'There was a hobbit who lived in...' on a blank piece of paper and worked backwards from there.
Tease.