I deeply disagree with approach and way of thinking in
that article, it's just rambling without any value in it.
We can't possibly draw conclusions about what we don't know...and those guys are doing just that.
Let's not forget, intelligence can manifest itself in many ways and we have examples here on earth (primates, dolphins, cetaceans.. even craws are quite intelligent), and technological civilizations are not the only necessary outcome of the evolution of life, even if intelligence is (which I doubt - it took 3.5 or more billions of years for homo sapiens to appear, we are here - how long - 100ky only?).
Also, difficulties related to interstellar communications and/or travel are enormous.. perhaps detrimental both physically and financially (maybe they also have liberal/trumpesque governments as well)
I say, lets just wait and see what happens... and let's keep looking.