It describes some of the aspects that affect the brightness of the Starlink satellites at various phases of their mission and the mitigation techniques being adoped by SpaceX.
Interesting read. Pity that Space X did not think before they went charging ahead and had the fore site to consult with others that operate in the Space/ Astronomy field. It would not only have been appropriate but good manners as well. We can only wait and see what transpires and hope for the best but fear the worst.