TITANIUM BACKPLATE: For the biggest and heaviest graphics cards and CPU coolers.
1. Is it really made out of solid titanium? All sorts of things can have "titanium" written on them and not actually feature the metal in question. See: Almost everything made for a PC, ever.
2. Even if it is a titanium backplate, it doesn't affect what sort of GPU you can put into it. The card still obviously inserts into a plastic slot with the normal gold plated and soldered contacts, on to the PCB intself. The end of the GPU is supported by the PC's case and its screw, when it comes to potential "sag". And of course, your GPU's bacakplate. Although if you've got a heavy GPU then a big, strong backplate on your graphics card, and a big strong case, and a massive backplate on your motherboard (which is a gimmick) might well result in the weakest link being your graphics card's PCB, at the point of connection to the mobo.
3. The backplate doesn't support any CPU cooler, either. That, also, would be left as always to the mobo's PCB. In fact, it looks like that backplate could possibly be a hinderance to the backplates of some CPU coolers, in which case you'll end up removing it and relying on your PC's case for mobo rigidity and support, as you always did.
This board sounds over-hyped. Too many capital letters in the literature gives it away, doesn't it? DDR4 BOOST!!!