He rolled back his factual claims long after more evidence came in, and to this day hasn't acknowledged the misinformation he spread about the Khmers. It was one of the worst genocides of the 20th century, and his role in it was to sow doubt about it in the West.

I don't think that needs to be called out any time Chomsky says anything; it's usually not relevant to what he's talking about. But in this particular instance, it seems extremely relevant.