Couldn't they have added some of the polarized window and camera filter to deal with the sunlight? I seem to remember CTV using Rosco filters during the Vancouver Olympics that did not affect the screens?
I'm not sure it would work that well - that treatment works very well for direct light, where the windows are in-vision and you are trying to reduce the impact of a burned out background.
However in reality because the polarisation system doesn't actually drop the light levels in the space (other than by the amount the window filter acts as a mild ND) - and once the light starts reflecting off surfaces the polarisation is altered, and the reduction in light levels hitting the camera doesn't change as much.
When you see Rosco polarisation products in use you can see this effect really clearly on anything that changes the polarisation of the light - like hair, fabric etc. Blonde presenters' hair often looks horrificaly back-lit because their hair alters the polarisation, and is then seen at something like full-brightness, the same goes for furnishing fabric which can make sofa edges look thermonuclear. Some reflective surfaces in a studio will also do this.
However the issue in this case isn't the light levels per se, it's the fact that the box is being lit from all sides (it isn't in direct sunlight as far as I can see) but it does suffer heavily from ambient spill coming in from three directions.
