It's explicitly said that they are not only unnoticeable through the force, but completely insusceptible to direct force attacks. This means they are not connected to the force. If they were, force powers would directly affect them. Force users can learn a power called Vongsense, but it requires both a connection to Vong biotechnology and a complete (but temporary) disconnection from the force. If there is an actual argument in your favor other than "The force connects all living things", please mention it.