The law says
IRPR r. 44(1)The class of persons who are the subject of a report referred for an admissibility hearing under subsection 44(2) of the Act is prescribed as a class of persons.
Members
(2)The members of the class of persons who are the subject of a report referred for an admissibility hearing under subsection 44(2) of the Act are the persons who are the subject of such a report.
Obligation
(3)Every member of the class prescribed under subsection (1) must appear at their admissibility hearing before the Immigration Division if they are given notice of the hearing by the Division.
IRPA Authority
Justice Laws is the authoritative version. If this copy and it ever differ, Justice Laws wins.