No, a correctly built HDMI audio extractor must not feed any voltage back into the HDMI.
If your laptop has died as a result, there may be a defect or faulty design.
Hello, according to the technical specifications, the device offers: Special Features: CEC Pass-through. I bought the device because the audio output of the Raspberry Pi 3 is not usable. The Lindy takes the picture signal via HDMI and routes it directly to the TV. The audio signal (also via HDMI) is extracted by Lindy and routed to the stereo system. The volume is controlled by the amplifier.