Earlier quoted context omitted.
> Decisions by the parliament are treated as immutable there? Yes, and no. Parliament is sovereign -- it is the supreme legal authority. But it cannot bind its successors. So any law parliament creates, any decision can be overturned by a subsequent parliament.
Is that not similar to how the US constitution is managed? It was amended and latter un-amended in the case of prohibition (18th and 21st amendments)
It's more general -- no branch of government can bind its own successors. (With the exception of e.g. presidential pardons which cannot be undone)