Explain to Me

Given that the constitution is a reserved matter under the Scotland Act (1998), only an act of the Westminster British parliament in London can grant a Section 30 order. It cannot be legislated for under any circumstances in the devolved British parliament in Scotland. And precisely because Westminster – and Westminster alone – is sovereign, no set of conditions or political realities in Scotland can compel the British government in London to grant a Section 30 order. What does this mean?