According to a link in the article the judge says Mueller’s appointmentment is legitimate because he is supervised by a constitutionaly appointed officer. Levin made the case Mueller had the powers of constitutionally appointed official without being confirmed by the senate. Mueller is running his own office with broad powers. It is not like he is just an aid to Rosenstein.
IIRC, he stated that eventually this argument would be made in court, perhaps at the appeals stage, and would be found to be a valid argument, thereby rendering moot, null, and void everything Mueller did.
“ Muellers appointmentment is legitimate because he is supervised by a constitutionaly appointed officer”
So, neither the AG nor any of the DAs need to be confirmed?