This video does not debunk that plants are sentient. All these people have faith that brains generate preference and self awareness. That is still very much up for scientific debate. Unless these people are all neuro-biologists with documented research, there opinion does not matter.
I will say, they make good points on less plants being harmed if less animals were bred for consumption.
Aside from that, there is still a large possibility brains aren't needed to discern bias which can also be considered a self aware consciousness. AKA Sentience.
And as for plants not responding as was said at 5:48
, a Touch Me Not responds to touch instantly via chemical reaction after being touched.
Aside from all that, these arguments foundations lay on the idea that "plants aren't sentient because they can't feel pain". Some people can't feel pain, does that mean they aren't sentient?
Sure the obvious difference is people have a brain, but the obvious similarity between people and all living organisms is that we have likes and dislikes. The ability to harness that decision should be considered consciousness IMO (not that it matters). I'm not advocating for pro plant rights, but I do like scientific facts.
I don't care about the vegan movement. I see everyone feasting on beef and chicken flavored insects in the distant future.