It is a real time scan simulation to show what will happen if your Images are used for Professional works the render above have been made just by changing the Pix/In amount in Poser nothing else . Then a Print scan simulation as it is clear your screen of your standard Monitor will only display 72 or 96 Dpi but a Image for Print for example needs at least 300 dpi. every saved Image in Poser 12 if used for Printing needs to be adapted manually this is fact. 

But sure you can take a Mathematical Template  to recalculate the effective dimensions for your Print that will have again an outcome of 72 dpi  then using Gimp or Photoshop to change your DPI in your work. If you get a assignment for a work that gets Payed for Printing purposes you sure need to deliver what has been requested so either you recalculate or just have a working dpi setting in the app you are working with not just one that lets you think that you have it .

I Agree that it is complicated if you are not using your renders for Printing assignments or for a Gallery expo and because of this it might be easier if the Poser staff just removes this setting in Poser 12 just like in Blender that is limited to  72 - 96 dpi , ok Poser will be limited to 72 dpi . and then just recalculate what you need for Printing!