A standalone course, which presumably comes from the ethos of rejecting degree-based education, is completely free to call a spade a spade.
All of the computer-whatever bachelors from around the world are not allowed to sign up for it.
Historically and foundationally CS is a child of mathematics and electrical engineering, neither of which really fit the narrow English term of science.
CS is mostly preoccupied with a) making (useful) deductions in closed logical systems, and b) building cool shit. Empirical knowledge generation is usually only relevant as a tool to help us with the first two goals.
There is a notion of experimentation in pure CS, because CS asks the question, what can be computed on physical machines. And to check that, you actually need to build and check.
Nothing illustrates this better than Quantum Computing. Computer Science (and Physics) theories predict the existence of quantum computing, and suggest a computational advantage, but we will never know unless we build QCs and experiment.
To me, it is that at our core we are a society of marketing bullshitters. The vast majority of daily activity is marketing falsity as truth to each other in basically all context.
Astronomy isn't called "Telescope Science" though..
Computer Science would be computational theory, complexity theory, a proof based cryptography course, the mathematics of computer geometry/machine learning type stuff.
About 80% of the courses here are software engineering courses - about using computers to build things. The quote 'computer science is as much about computers as astronomy is about telescopes', comes to mind.
Just call it 'a self-taught education in Software Engineering'.