The disconnect here is that I have a degree in polsci and have read much of Chomsky, and you're repeating a "debunking" (replete with declarations of "fallacies") in a manner that is popular with people whose level of familiarity with political science is "I am active on Reddit".
"Therefore, without further clarification, I must assume" (what a mouthful!) that you are an argumentative teen with a "debate me bro" mindset.
One of the key problems of online exchange is that it is impossible to synthetise expertise without someone much less knowledgeable driving by, and demanding ELI5 level proof. They believe that they must be capable of reaching the same conclusion as someone who has spent years on the topic, and they must get it now, and they firmly believe that the onus is on the expert to give it to them (for some reason). The implication being that years of familiarity are irrelevant unless you replace your nuanced point with "pan in the face"-level direct evidence, such as would satisfy the "debate me bro" teenager who is demanding it. All expertise is invalid except that which an inexperienced Redditor can see with his own eyes (an obvious parallel exists here to conspiracists who "do their own research").
Consider that it would be relatively trivial for me to just type "Chomsky khmer rouge" into Google and throw some random refs at you, and that there may be some reason I haven't done so.
It is both (a) pointless - in that I truly do not care one jot if I have provided a satisfying level of evidence to you (and what about the next Redditor that comes along? and the next one? are we to be stuck at this level of discourse forever?), and (b) fairly deleterious to discussion that happens at a level more sophisticated than first principles.
Consider the implications for the progress of society of being forever stuck in ELI5 performative debate for the benefit of random lay people. The FOX News-ification of all of academia. The reduction of all human knowledge to that which is digestible to the average Redditor.
I note also your reference to right-wing propaganda, etc. From an academic perspective, this is just such an irrelevance. I am not a Marxist, for example, but I find Marxism to offer an occasionally useful lens on economic power relations. If you're still indulging in partisan "he says she says", then I respectfully do not think we're operating at the same level on this topic. That's not to diminish your intellect or knowledge in other fields. I'm sure there are many other skills you have that I do not.
You are entirely free to walk away completely confident you're right and I'm wrong, and this is something that will never matter to me in any way for the rest of my life (I will forget that this exchange ever happened within days). I suppose I engage only in the (probably vain) hope that I might plant a seed in you or someone reading this. I'd consider you going back to read Chomsky a win here, even if I disagree with a lot of his conclusions, because at least there's more to him than this "debate me bro" hellscape.
I won't reply again - this is not a good use of my time. Up to you whether you choose to interpret that as a win (epic Redditor destroys boring academic with facts and logic!) or an opportunity for contemplation.
