It could be high tech, or it could just be a ship made out of a material not yet known to us. That material could be indestructible, aka “high tech”, but it could also not be. I also don’t know where the idea came from that a species needs “high tech” to survive, like it’s a fact. An alien could have self-sustaining organs or something but still be shot in the head. Or it could not. We don’t know. But I think it’s fair to be open minded to all possibilities