The HPNA light is only on if a device is using that connection, usually a STB connected via coax (can be over twisted pair in rare situations like apartments). It sounds like your setup uses ethernet which would not turn on the HPNA light.
The previous scene is an excerpt from Brain on Fire: My Month of Madness, and just one of many hallucinations Susannah Cahalan experienced in 2009 during her month-long hospital stay, in which she was diagnosed with a rare neurological autoimmune disease, known as anti-NMDA receptor encephalitis.
Susannah Cahalan was a young New York Post reporter when she started to forget assignments. She became fixated on the idea that her home was infested with bedbugs. Paranoid and irrational, she laughed and cried inappropriately, moods rocketing from euphoria to intense sadness. She thought it must be stress, or the flu.