zlacker

As an Amazon employee you can tour warehouses. And warehouse employees can shadow/tour other buildings/organizations. It's pretty commonplace. It's unlikely they'll approve a tour during the middle of COVID (considering tech workers are being forced to work for home). But the UX designers could very easily have personally seen the working conditions of a warehouse.

Further employee affinity groups span organizations. It's not uncommon to have friends in different areas of Amazon (including warehouses). So they could be hearing about conditions from their friends. Amazon employees also have access to internal company information about COVID response.

I'm not taking a stance on whether the UX designers should have been fired. Just pointing out that a UX designer employed by Amazon has more access to information about working conditions in warehouses than 'the rest of us.'