Furthermore socializing the economy, be it through coops, state owned enterprises, syndicates, or some other format is key to socialism broadly

The rejection of communism is also silly because communism is the state that happens when post-scarcity and an end to class distinction is achieved.

What you're describing is social democracy at best. Democratic socialism doesn't reject Marxism, Marxism is a key theoretical tool that any socialism that isn't pure idealism uses. It is the theory that describes the historical development of societies, class conflict, and power dynamics from them.