The article has so many problems its almost not worth responding
However lets take the basic assertion that it 1.5x10^26 J of
energy for interstellar travel.
The sun's power output is 3.8 x 10^26 J / sec.
So you have to present an argument that the civilization would
not want to expend a few seconds worth of energy to colonize
a nearby starsystem.
It is far more likely that colonization is frowned upon
because colonies are likely to be competitors than
colonization is prohibitively expensive.
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