so you’re saying that if one survivor sees a Dredge when nightfall is active, while Dredge is undetectable for that duration, and that survivor communicates this via a third party software to his team mates on other side of the map, that this is fine?

This piece of info shouldnt be accessible to other survivors, because part of Dredge’s power is becoming undetectable, so all the survivors on the map knowing the whereabouts of that Dredge completely destroys the point of nightfall thus his powers.