"PPE is very hard to get right now" is one thing but the workers are complaining about stuff like not even having access to hand sanitizer. That's basic shit. If you can't get your employees a way to properly wash their hands you shouldn't be operating a business during a pandemic. I don't care whether it's because costs have climbed or you made an oopsie, if your facilities don't have essentials like:
running water + soap so people can wash their hands
usable toilets
central heat/air so that employees don't overheat or freeze
Then you're not prepared to operate them. Amazon is not some small business. They have billions of dollars at their disposal that they could have been using to prepare for an epidemic - basically an absolute certainty that one would eventually impact local amazon fulfillment centers, sooner or later - by stocking basic stuff like soap, gloves, etc. Arguably they should have been keeping those stocked and available for day-to-day business, but whatever. Incidentally I mentioned heat/air there because people getting sick from overheating inside Amazon warehouses is a common occurrence. These facilities are not well-run.
There are many other complaints in the article that are not addressed by your defense here. How is "you're making sick people work overtime during a pandemic" a manufactured crisis? Do you really think that's a good business strategy and something workers should be okay with?
Sure maybe they can't get their employees n95 masks or even surgical masks. Aside from that they had plenty of opportunities to build a stockpile of that stuff in advance - if they didn't then yes, they can't exactly just bring in a truck full of them tomorrow. Sure. But does that mean it's okay that it took them weeks to quarantine a couple of union organizers after exposure to an infected employee? If Amazon is doing such a good job why weren't the infected employee's interactions tracked immediately and responded to by quarantining all employees who made contact with them right away?