My two cents: I think LeCun is totally right about this one, but it appears perhaps politically incorrect to be scientifically correct.
Serious academics flee from such topics for good reason. See for example Eugenics.
And since they're positive claims we can't know either of them are right without evidence, which is not provided.
Those two statements are part of the same thread and LeCun makes it more clear in that thread. And the article says, right after the second statement: "If you read that thread, you’ll see that LeCun seems well aware of everything I’ve laid out in this post"