APS generally refers to hard-kill systems like Trophy/Arena. Things that actively go kill the missile or projectile coming towards the fighting vehicle. Shtora is not active, it simply disrupts the laser guidance (if it can detect the beam in time). It's no different than an ECM jammer on a fighter or surface ship.
Of course regardless of efficiency, an APS system has to be installed in the first place and it is possible that that is not the common case in Ukraine.