I think there is a lot of truth in the rumors. I have seen a decklid that was warped (albeit slightly) with lifting on the outer edges. I assume it is to do with the location and angle of the struts and their 'power/strength'. The struts mounts are placed too close to the decklid hinges (remember your high school physics: fulcrums & bending moments).
I cannot use any decklid shocks on one of my Pantera's as it forces the lip of the decklid into the roof no matter what I do. I'm going to change the mounting locations further rearward on the decklid when I can get to it, but that will require repainting the decklid.