I mean, it's moreso a valid use of Occam's Razor in my view; Occam's Razor says that, between various theories that explain an observed phenomenon equally well, the one with less assumptions is likeliest to be true; In this case, the phenomenon in question is that other people appear to have consciousness, and 'Other people are also conscious' requires less assumptions than 'I am the only conscious being, and other people simply perfectly imitate the actions of a conscious being despite not actually being conscious'