Fair and correct. Cert denial means the Court declined to hear the case, not that it endorsed the lower court's reasoning or settled the question nationally. The DC Circuit ruling stands and the Copyright Office's position is consistent, but that is stable doctrine rather than Supreme Court-settled law. Updated the piece to reflect this distinction accurately.
Since this is a tech audience... the Supreme Court uses a bounded priority queue. An unbounded queue would risk growing impractically large.
There are some kinds of cases where the Court has "original jurisdiction," meaning they must hear them, but those are very rare.