Section 28.05 does not state it in its entirety ... only in 28.05 (2) as it relates to lack of representation.
I don't understand why you think this rule is being overlooked. Basically 28.05 (2) says the pre-trial conferences must be held behind closed doors if the accused does not have representation (which is not the case for DM and MS) ... for all other pre-trial conferences, they are open to the public unless closed at a judge's discretion under 2.01.
It also says :
28.05 (1) Unless otherwise ordered by the pre-trial conference judge under rule 2.01, a pre-trial conference in a case where all parties are represented by counsel, shall be conducted in a pre-trial conference room, judges’ chambers or other suitable room in the courthouse where a full and frank discussion of the issues raised in the proceedings may take place.
Judges chambers and conference rooms are not open to the public- so safe to assume that this means a place away from public view as with 28-05 (2)