We never really see materia used within technology other than to give it power (Mako power) or during combat (Mako Cannon, Palmer's Mako Gun, regular materia). Just like we don't see people use fire materia to light their stoves, I can't see Cait Sith being controlled by materia, especially when he's part of such a technologically advanced corporation.
The cat he rides on was "magically brought to life", which could be a from of materia, though it sounds more like pixie magic to me.
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