This is utterly incorrect, both in the theoretical and the factual. Virginia was one of the colonies which won independence from Britain and was indeed a State before the Congress ratified the Constitution, or even the Articles of Confederation. -- If it were to 'revert', then it must needs be revert to an independent State [read nation].
As a territory, the Congress has the authority to set boundaries and to establish state governments, which the Congress did. Congress retains the right and duty to directly rule areas in insurrection, because of the constitutional guarantee that each state has a republican form of government.
This also is incorrect.
Except that Virginia signed onto the Union with the Declaration of Independence. They signed onto the Union with the Articles of Confederation. They signed onto the Union with the Constitution.
Virginia was never an independent state outside the Union. It was a state as part of the Union. If the state went into insurrection, it remained part of the Union, but the state government is no longer an instrument of the sovereignty of the people of the United States, and is thus invalid, but the land area remains part of the US. Accordingly, it remains a US territory without a legitimate state government.