Sigh, are you reading the same novel I am? Or just not interpreting it?
If we remember history, Russia which participated in WW1 ended up leaving early in the war. The large amount of casualties in WW1 created a weakness in Russia allowing the communists to use it as leverage and get support for their revolution against nobility. Thus, Russia had to bail out of WW1 because it risked collapsing from the inside.
What the MC in DD is doing is similar, yes. It's not about being communist or not, it is called strategy. There are multiple human countries he is fighting against. He is trying to spark something similar to a communist revolution in those countries to weaken the power of nobility so that he can take over the countries easier.
It ain't about whether MC or author believes in communism or not. He is simply using it to weaken his enemies.
But rest assured, in our world, the final form of government will be a form of communism