I could be wrong but all 23' Malibu's before 2004 were diamond hull boats. That includes the wakesetter LSV, sunscape 23 and hatever other 23' vdrive models they had.
J-rod or one of the other CIE guys use to have one back in the day I think. Maybe they can chime in.
Also, for wakeboarding I would assume it has a near identical wake to the 21' vlx's with the diamond hull. If so I seem to remember people saying that the wedge is a must have. You really need to use it to get any kick out of the wake. Without it, the wake is really rampy I think.