There was no explanation — other than the below.

But it means more votes will be counted in Pennsylvania — and it clearly means the Chief Justice chose not to join the conservative wing — and just ruled on well-settled law — in this denial of review (which is itself effectively a final decision in favor of all votes being counted, in the Quaker State):

…SCARNATI, JOSEPH B., ET AL. V. BOOCKVAR, SEC. OF PA, ET AL.

The application for stay presented to Justice Alito and by him referred to the Court is denied.

Justice Thomas, Justice Alito, Justice Gorsuch, and Justice Kavanaugh would grant the application….

Yup… I am grinning, ear to ear. Onward — to a soft scoop and hoop tomorrow in the inky black of space….

नमस्ते