I think the point was that some organisms on earth exhibit traits of intelligence, like Dolphins, and that there could be Alien organisms that are like Dolphins

I think the point was that some organisms on earth exhibit traits of intelligence, like Dolphins, and that there could be Alien organisms that are like Dolphins that also show signs of intelligence. But just as humans and dolphins on earth cannot live together socially, that intelligence is either too primitive for them to travel to other planets to seek out life alien to them (have you ever seen a Dolphin craft material into a structure that could be used for interplanetary travel?), or is too complex for us to recognize that it is actual intelligence. Although science fiction has been littered with thousands of stories of alien life visiting us, we humans only know of the fact that humans from Earth are the only organisms looking for life on other planets that we know of. I don't think anyone would doubt that any organism with the capacity to travel to other planets, let alone other solar systems and possibly other galaxies, is un-intelligent. Although we might be biased, we're a pretty intelligent species, as long as the metric is ourselves.