" Nonetheless, the results indicate that either humanity really is the only intelligent species in this part of the universe, or advanced civilizations are far more efficient in their use of energy than is reasonable to assume."
Advanced species abandon or never develop the human invention of "civilisation". These other species may be the dominant species on their planet, they just know how to live in harmony with its biospere and have no need to invade other planets, much less each other's social groups.
Given this is slashdot, you're probably thinking "fuck Heineken man - we're talking' computer shit around here dude!"
So my oldest piece of digital gear is a box of floppy disks from the mid 1980s - "original copies" of files I made and some software that will never see the light of day, and sound disk for my 1986 DSS1 Sampling Synth that is mouldering in the basement.
I'd call you a troll, but that would overstating the case, and it's possible you're something stupider, like a republican.
All power corrupts, but we need electricity.