I still think it's completely inappropriate to make such a comparison in this context.

I really don't because Robinson is absolutely preaching an ideology that would lead to mass death if it were taken seriously.

Will they kill children by slamming them against trees or killing people with shovels? Or will they "interrogate" people until they die? Will they kill 20% of population in 4 years?

Your comparison is inappropriate and cheapens the suffering of people who lived under Pol Pot.

What exactly is he saying to do, that is going to lead to these deaths? I can't find any mass death approval in the linked article.