You only need to watch the first six minutes to hear what I'm talking about.
I think it's a mistake to understand political correctness the way he does. He frames it in terms of unanimity and restriction - the idea that political correctness means we need to agree on everything or that we get in trouble for what we talk about rather than how we talk about it.
I agree with him that we need to have conversations - hard conversations. I believe in freedom of thought and speech and the value of saying things that maybe not everybody is going to like. But I don't think political correctness negates this.
Political correctness is essentially public politeness. Its benefits are in letting people participate in a conversation who would traditionally be kept out. It strives to keep personal attacks out of sensitive arguments. It's to broaden conversation rather than restrict it.
I think it's a mistake to blame political correctness for the difficulty in talking about hard or complex topics. The reason it's hard to have conversations about a lot of important things is that a lot of those things are hard. The content makes it uncomfortable, not the PC police.