The author claims that this kind of images shouldn't be in the training data, and agree or disagree with that, I'm unsure how much removing it would actually prevent such images from being generated. AI can certainly cobble disparate concepts together quite well, it seems unlikely violent and visceral images couldn't be regenerated from other non-violent content.

I think it speaks to the unfamiliarity the author has with the workings of AI. A misunderstanding of the latent space and how it can generate bizzare images when it has little to go off of or inverse negative directions.

AI can barely figure out how to make a cartoon pelican ride a bicycle.