Posadism attempts to introduce elements of ufology into Marxist thought.

WTF?

...Arguing that only communism can allow the development of interplanetary travel.

I'd argue that the infrastructure we need to colonize other worlds is going to require larger organized population than capitalism can provide.

But as a reader that sees ideologies as starting points (that need to be developed so as to create a pathway to post-scarcity), I can't say what the corruption-light system is that will allow for interplanetary colonization and trade.

The fabricator IRL would be late-game magitech that manipulates huge amounts of energy. (A fabrication failure could annihilate a continent). Far, far, sooner, we'll have the food-printer / turbolift system of Star Trek TOS to deliver us our custom-made coffee.

Meanwhile, in 2024, we're having a tough time escaping the gravity of fascism-driven autocracy.