It can't be used for a boost converter, because it simulates an inductor. Unlike an inductor a gyrator can not store energy. The energy you put into it gets dissipated as heat, and the energy delivered from the simulated inductor is drawn from the gyrator's power supply. All the signals levels on the simulated inductor are therefore limited by the supply voltage, so it can't generate a higher voltage like a true inductor in a boost converter.