When it comes to contributions to the body of international science, putting space stations in the air and putting rovers on planets are a lot more important than the propaganda victory of a spacewalk. A person doing a spacewalk on the moon isn't even as efficient at collecting mineral and soil samples as a rover would be. It's also kinda irresponsible since it puts lives at higher risk than just doing standard space missions.

At the end of the day though, this is just a communist shitpost. Science has always been international collaboration and not a national chauvinist thing. Communists are the first to acknowledge that since communism is an internationalist ideology that upholds the working class.