Earlier quoted context omitted.
I have a friend at Amazon and they say absenteeism among employees is through the roof. They can neither hire nor keep the employees they do have.
That would fall under the "they can't afford to deliver the orders they have" bucket if they can't find anyone that wants to do the proposed work. If true, Amazon is selling a service that isn't robust or flexible enough for such a season. Will be interesting to see how it shakes out.
Long term is probably a combination of autonomous robots, self-driving vehicles, and delivery drones. The current crisis might even accelerate its development and deployment.