The answer may depend on exo-planet politics?

Interesting article, aside from the "climate change" angle...(it's environment, stupid...Not Climate!)
However, the authors bring an interesting point.

Harkin back to ancient civilizations. They obviously had technologies and understandings of the cosmos we do not have today. They built out of stone and didn't broadcast their presents to the cosmos either but they seemed to get by quite well inspite of it all.
Let's look at this from a different perspective. Perhaps, as the books of Enoch pose, we had help from creatures that weren't quite on the up and up...evil you might say. They self destroyed their handy work, poisoned our genes and forever left us with that reminisce in the ruling structures and self assertive creatures of our world.
So, perhaps it would be a smart thing not to announce your presents to the cosmos, leaving the smallest footprint of life as possible so as to not attract the wrong kind of attention.

Of course, all this is conjecture and hypothetical but is something to consider.
Perhaps they are, in fact, watching and shaking their heads in amazement at us stupid humans.