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just means that a later Congress can vote to repeal whatever laws that an earlier Congress had voted to enactLaws aren't passed by the Congress alone. OP is confusing the law with e.g. the principle that says the 118th Congress can't adopt a House rule with two clauses:
(1) All Democrats must tape a weenie to their head, and
(2) This rule may only be changed by unanimous consent.
When it comes to laws, they can't bind the Congress (collectively) but they can bind its members individually. For example, the 118th Congress can't pass a law compelling the 119th Congress to pass something else. This doesn't arise out of any law, but is a natural result of, quoting Cicero: "when you repeal the law itself, you at the same time repeal the prohibitory clause, which guards against such repeal" [1].
[1] https://ij.org/cje-post/state-con-law-case-of-the-week-can-o...