Contractual obligations cannot override laws does not mean the law is not legally binding. It just means that a contract cannot be put on an equal pedestal as a legal basis since a law can override it. Say a consumer protection law states you have a warranty that is tied to the device and not the purchase. But then the manufacturer put ToS/contract clause stating the warranty that comes with the device must be accompanied by sales receipt as well as the warranty card. Those clauses are not legally binding and if the company doesn't honor the warranty, you can sue them for breaking said consumer protection law instead