Best way is to test it. Get the voice commands to work. Then non-destructively block the mic. Does tape stop it from working? No? Try sticky tac or playdoh or chewing gum. Does that stop it? Yes? Maybe try something more permenant like hot glue or superglue. Then verify it still doesn’t work.
Sounds like hardware then. Try an old gpu or power supply.
Rocking Garuda here!