Your assertion that any sci-fi at all isn’t political is a particularly bold one.

Here’s my attempt at “let’s name a hard science fiction that isn’t making a political statement” and I came up very short.

• “Frankenstein” is about grave robbing and biology horror and in no way an analogy for mistreatment of neurodivergent individuals.
• “20,000 Leagues Under the Sea” is about a cool submarine and not about an ultra rich man’s extreme rejection of modern societal norms bending the world of those around him.
• “The Martian” was about the cold hard science of a man surviving on Mars, and not all about humanity briefly overcoming our national rivalries to do the human thing and being one person home safely.
• “The Robot” is just about a time traveling robot, and not a sad prediction of mankind’s likelihood to erradicate ourselves leaving only our automation to remember us by.
• “Bicentenial Man” is about robotics advances and has nothing to do with marginalized people fighting to have their human rights acknowledged.
• “The Expanse” is just about how dangerous space is, and not at all about how humanity tends to break off into adversarial groups.
• “Snow piercer” is about a cool train in the cold. Okay, now I’m not even trying anymore, lol.

I’m not saying it doesn’t exist, but no classics come to mind.

Hang on, I’ve got two:

• “Around the world in 80 days” is arguably at least slightly more about globe trotting and less about putting up with a rich employer’s bullshit.
• “Journey to the Center of the Earth” is mostly about cool caves and dinosaurs?!

I should reread these two, but I don’t remember many political messages.