“The Court also finds troubling [Lawyer’s] failure to identify or bring the non-existent case citations to the Court’s attention before the hearing on the motion to compel arbitration. The Court should not be left as the last line of defense against citations to fictional cases in briefs filed with the court. While [Lawyer] did not create or rely on the fake citations, he also did not detect them. Instead, he admitted he did not review the cases cited by his opponent….”