In the Australian context he is technically correct. The CDT's aren't part of SOCOMD-A, because they are part of the Navy...
However their maritime tactical operations role, the contribution they make to TAG-East and the training, equipment and taskings means that the units most definitely are a "Special Force".
That nonsense about what they are "like" is a load of tosh. The Incident Response Regiment and the Special Forces Signal Squadrons ARE a part of SOCOMD-A which means they very much ARE "Special Forces" they may not be badged SASR operators or Commando Operators but that doesn't mean they aren't special forces operators. Not in the slighest. It is their training, equipment, force structure, role, restricted entrance and overall capability that makes them "special".
Not any silly generic description of what a "special forces" unit is. "To seek out and close with the enemy to kill or capture him" is not the role of the SASR. THAT is the role of the infantry. It goes on a bit more, but maybe this means that SASR aren't really "special" either?