@emmalbriant
This does not sound like spreading disinfo to me - I hear Chomsky arguing for factual accuracy. He says the Khmer Rouge committed atrocities, the US bombing of Cambodia was no better & concluding "it is not proper to lie either in defending the crimes of your own state or exaggerating the crimes of your enemy."
Fidelity of facts is what we need more of in these days of the Trump-inspired dumpster fire of disinfo that's destroying democracy.
https://youtu.be/f3IUU59B6lw
You have the advantage over me if being an expert in the field.
However, my reading of your source material is that Steven Lukes' primary criticism of Chomsky appears to be that he finds him "pedantic." With the context of Chomsky's argument in the YouTube vid in mind, it appears Lukes is misconstruing or distorting Chomsky's pt, which is that Pinchaud's figures were presented & accepted as factual when they were not. He acknowledges the precise numbers are unknowable.