They are wrong because some planets have the requirements for life, like Kepler 186f. Kepler 186f is a habitable planet for life because it's in the habitable zone of a solar system. It also has water and oxygen, which are required for life. "Based on those numbers, we can estimate about 300 million habitable worlds in our entire galaxy." This evidence contains an explanation that there are many habitable planets in the galaxy, meaning there could be life on one of these exoplanets. "They have had billions of years since they formed for life to develop and for intelligence and technology to emerge." This means that there could be life developing on one of the many exoplanets in the galaxy, but we just haven't found the specific exoplanet yet.