That's terrible advice, I hope you're being sarcastic but I fear not. There's plenty of useful stuff outside of CS which isn't liberal arts.

Maths, stats, electronics, physics could all be useful in an entirely computing-based career.

Biology or chemistry could open up a career in bioinformatics, molecular modelling or simulations. Likewise linguistics for text mining, information retrieval, speech/language processing.

Economics if you're interested in being an entrepreneur.

The crunchier end of philosophy, where it overlaps with maths and linguistics and cognitive science, will give you a much deeper frame of reference for understanding many hard problems.

Not all computing jobs involve twee social web startups or mundane CRUD.