I watched the video you linked and it does not make that claim. What he claims is something completely different. He claims that, in education, we expect all students to conform to a certain standard (hard working, attentive and so on). The extreme example of this, he says, is that we have started to classify unconventional, different behaviours as new pathologies.

He furthermore argues that this is incorrect: pathologies like ADD should be considered simply differences in behaviour which are a positive thing. He argues that we should not medicate people into becoming something they are not.

So, he doesn't make this claim at all - but he expresses a potentially valid subjective opinion that cannot offhandedly be verified or denied: it's mostly a matter of definitions.