You think wrong. It (SR MTE-100) was invented for MTBs back in the olden days, usually used in conjunction with the equally Heath Robinsonesque Hite Rite dropper doodad to let you adjust the saddle from high/forward for climbing to low/rearward for descending.
What is that monstrous seatpost? Why not just get a proper-sized bike instead of all that layback, and why would anyone ever need a QR saddle clamp?