Pol Pot is quoted exactly zero times in this article. To address the Ieng Sary quote, which is probably what you mean to refer to, Furr alleges that “the Pol Pot group [...] sometimes described themselves as communists [...] in an attempt to get help from China,” yet doesn’t consider that Sary might have done the inverse to gain the support of ASEAN (to whom he told the quote, referring to the same page from Vickery). This is something Castro famously did to try and get the support of the US.
Prev. addressed the main example of the CPK’s “attack on the urban proletariat”; and otherwise the “attack” on the old ~intellectuals and on a certain section of the “urban proletariat” has nothing to do with a disdain for the proletariat in general but with the overall goal of ~erasing the past and constructing a new “revolutionary culture,” which does not exclude factory work (the GPCR had the same targets and many others and yet was also motivated by a genuine belief in communism).
I’ve already explained how the CPK objectively didn’t fetishize agrarianism, which rules out the possibility that they fetishized agrarianism “due to a severe distrust of the proletariat”. You can further look at confidential CPK documents, including the four-year plan I mentioned previously, where for instance it’s resolved to “continue to strengthen and expand the building of revolutionary culture, literature and art of the worker-peasant class in accordance with the Party's proletarian standpoint” (p. 113). And in doc. 6, Pol Pot reports that “We have nourished political consciousness, proletarian patriotism and proletarian internationalism” and that “proletarian patriotic consciousness and proletarian internationalism can transform people's nature into something new. As for the problem of nurturing a Marxist-Leninist viewpoint, we should allow this to seep in according to our chosen methods” (p. 202). Clearly the “Party Center” believed that they were representing(/serving the interests of) the proletariat, and that this was the basis of their legitimacy.
Further, I find your comment about Deng and Mao with the US to be misplaced. Deng and Mao made mistakes in allying with the US. Pol Pot’s mistakes far exceeded their mistakes.
That may be so but I'm only saying that in terms of support for the US, Pol Pot is not unique and actually happens to be perhaps less effectively pro-US than Mao and Deng.
Pol Pot was used as a tool to extend imperialist interests in the region
Definitely true, and yet he was also a genuine communist. And don’t forget that he also opposed Vietnamese ~imperialism. So the choices are to become a Vietnamese satellite or to attempt to assert national independence and in so doing support the US’s goal of containing Vietnam (and the USSR) (although if successful DK would become its own problem), and the result is that the second option ends up at the first. “The Pol Pot group” (Furr) really had no choice.