"It's wherever you are. If it's tapped into any of your senses, it knows where you are and what you're doing," highlights a constant, pervasive surveillance or awareness. This suggests a powerful entity or technology capable of sensing and tracking individuals at all times, creating an intense sense of vulnerability and loss of privacy.
In the context of the story, the protagonist's realization that nothing they do is private, even in personal spaces like the bathroom, causes their spirits to sink. The Gasman's surprised reaction emphasizes the unsettling extent of this omnipresent monitoring, adding to the themes of control and the fear of being constantly watched.