We have anecdotal reports from a few workers saying so. We also have leaked documents saying that Amazon does not allow peeing in bottles as policy. If a random employee does not follow the policy and pees in a bottle, that seems like the employee's fault. If the employee is doing so to make up lost time so they can appear more productive, it seems like that's an issue of under performance that they're hiding by peeing in a bottle. Either way, it isn't clear to me that this is either widespread among Amazon's employees or the fault of the company instead of the individual.

As for the denial - I am unclear on if they're talking about employees as a separate group from their drivers (who may be contractors according to other comments here?). Either way, I think it's reasonable for a company to make such a statement if peeing in a bottle is not a standard practice that is allowed by their policy and if it is only done rarely or by very few people (not reflective of general practice). If the delivery targets are such that most drivers have to do this, I might think differently, but so far I haven't seen evidence of this.