They are having it in the subtitle. In general their whole article is about two main points, first the use of stuff from Libgen, second the points of making people jobless. Three of their points are about the jobless thing two about the LibGen.
About LibGen, there might be more discussion - fair. However, the second argument is no real discussion IMO. Why is putting people out of work suddenly a bad thing? Since when do we argue this when talking about automation?
There is nothing to discuss about LibGen, really. I don't read this as OpenAI employees even believing LibGen is sketchy. They were worried about optics, because LibGen itself is Russian and does look a bit sketchy, and at the time - much like today - it was easy to make it a headline that makes people pattern-match to "troll farms".
(And then Russia invaded Ukraine, turning any association with .ru things into potential corporate suicide.)
Really has nothing to do with LibGen or with OpenAI. It's about people being easy to manipulate into believing bullshit, which is a reasonable worry, and the Authors Guild is trying to do that exact thing OpenAI was worried about.