That’s mostly just an aesthetic, they still have scientific advancements beyond ours. Your own link continually mentions Alien (which is outdated as I mentioned) which even if it was made today, they have interstellar travel, live long-term cryogenics, futuristic vehicles and weapons beyond what we have today.

Just because they use old blinky retro computers doesn’t mean they have dozens of tech advances over ours, that’s literally the most surface level way to look at that setting, which really doesn’t have a lot of modern stories and is mainly just an aesthetic used for art.