I had no idea what Posadism was until you mentioned it. Looking at it, I think elements of it are coincidentally in there, but I don’t think that’s totally what it’s trying to convey.

For one, Boseman, Montana definitely didn’t look that socialist, and yet Cochrane developed a warp drive; it was the new connections and widened view of the galaxy that facilitated the development of socialism. Sure, the Vulcans helped, but it was humans who had to change.

Also, I feel like “aliens helping in revolution” is sort of antithetical to the concept of the Prime Directive.

Overall, I think Star Trek is less about through ufologic socialism and more about peoples figuring out socialism for themselves; space and aliens are mostly just a plot device to explore.