I don't know what that guy is smoking. It is objectively the case that the topics of race, identity politics, etc have skyrocketed since the mid-2010s [1].
[1] https://marginalrevolution.com/marginalrevolution/2019/06/th...
[1] https://marginalrevolution.com/marginalrevolution/2019/06/th...
I can tell you that from my own life experience and what I can recall, it has certainly felt like a shift in content. All the anti-white stuff, the social justice stuff, the pro-censorship stuff, etc. It existed before in tiny bubbles like Tumblr, but it was during the mid 2010s that the major news sources started adopting those viewpoints too.
It's suspicious to me that they went for the hockey stick curve to demonstrate their complaint rather than adjusted for the number of articles that they are sampling from.
It's actually making my exact point that "diversity and inclusion" were mentioned in 0 articles in the 1990s. I'm saying that this is a relevant thing to more than 0% of the population, so there should be representation of that accordingly. And now that we have more articles talking about it, it seems reasonable that some percentage of news articles (above 0) would be discuss these topics.