A speaker-blind selection process selected a talk by someone who is considered by some to be offensive for reasons not directly relevant to the content of the talk.
Yet definitely relevant to the people who would choose to attend the conference. It's definitely going to make some people feel uncomfortable attending, knowing that they invited someone who believes that you are not deserving of human rights and dignity to speak.
The Lambdaconf guy who mindbogglingly rejects social media for being "fickle, highly emotional, and irrational" has no idea about free speech.
Moldbug has a record of going to professional confs and advocating racism. (Working to exclude people.) Furthermore, one of their sponsors is a racist political blog, which is unprecedented in my experience. (For evidence, see my comment history.)
Context: a country which notoriously kills and incarcerates blacks, as a replacement for slavery. Racism involves political actions which directly impact the lives of participants and users.
This creates an atmosphere completely counter to education. People always say "Hallway chats are the best part!" so it's not just about a talk.