Why didn't the three-body civilization let Dyson sphere absorb the energy of three suns?

Maybe the three-body civilization has not been able to produce Dyson sphere.

At present, the level of human civilization is 0.73, which has not yet reached the first level of civilization. This means that we are still far from the second civilization. Because type II civilization should be able to make something similar to Dyson sphere. It took thousands of years for human beings to develop to 0.73. However, it takes 1000 years to upgrade from 0.73 to the first-class civilization and then from the first-class civilization to the second-class civilization. Therefore, scientists predict that it will take us 6.5438+0 million years to make Dyson sphere.

The sun, the cleanest energy.