As it says right in the post, the Electoral Count Act allows the National Archives to only pass along the slate of electors certified by the state. That is literally the power given to it by law. If you or I sent in a slate of electors, they would not pass that along.
The Constitution says that it's the legislatures that send the electors for the states and not the state governors.
The law you mention abridges the the constitutional rights of the state legislatures.
The Electoral Count Act is not in the Constitution. The electors are selected by the legislature of each state through their approved state constitutional elections.... not the governor, sec of state or some judge.