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Pretty much every argument he had when he showed that "there isn't a difference between a pig and a person" can be used to show that there isn't a difference between a plant and a person so the conclusion from that would be eating vegetables is morally wrong too.

Huh... So in your view, there's no ethical difference between "killing" a kale plant, and killing a pig? The sentient of the pig and the lack of sentience of the plant makes no difference from an ethical or philosophical POV?

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For me personally it ends up being dependent on the intelligence of the animal. For example dolphins and elephants who demonstrated high intelligence and emotions so i feel very bad when those are killed, but cows on the other hand haven't demonstrated something that shows me how well they understands whats up for me to feel bad enough to not kill them for food, with minimal amount if pain ofcourse because they did show they are aware of that.

Of note, he did address the "intelligence issue" in the video. It appears that the hole in the approach you suggest here is that there are humans who aren't very intelligent either, and who are even less intelligent than a dolphin or pig, but we don't think it's ethical to kill and eat those people for food, so it doesn't follow that this is a valid ethical reason to kill other animals for food... Right?