If you have the DLX variant then your car does not have the option of tumble fold as it does not simply require it. They have given the option of smart board for the same reason. U just need to keep your board in place and then fold the seats down. That makes the rear seats space an even floor to keep bigger objects. Means the object is not upon the smart board and the backside of the rear seats
However the DX variant has the option of tumble fold because it does not have the smart board meaning whoever wants to put any big object in the rear cabin has to tumble fold the seats first and then place the object which then rests on the empty boot (above spare tyre) and the area beneath the rear searts
I don't think that is random. While at the Suzuki dealership the salesman demonstrated both the DX and DLX variants's features of tumble fold vs only fold (with smart board) respectively.
All the seats of DLX are bolted as far as I have seen. OR The models that did NOT come with the smart board earlier, before 2012 I guess, even DLX have the option of tumble fold...
Hope it makes sense 
