Possibly an extrapolation from Kepler data, which can only see planets orbiting at the right angle. If it were to be looking at an extra-solar system "top down"

Possibly an extrapolation from Kepler data, which can only see planets orbiting at the right angle. If it were to be looking at an extra-solar system "top down" then it wouldn't find any planets. For astronomers "earth like" is just about anything within an order of magnitude of earths size and within the very vague habitable zone, it doesn't say anything about it's surface conditions.