If you wind this page right to the bottom and read the piece on the tourer, which has been AFAIK from the press release pack verbatim, it says that the glass and tailgate cannot be open together.
I quote:
"One of its most attractive features is the ‘double hatch’ arrangement, whereby the tailgate glass can be opened independently of the tailgate. This allows easy access for smaller loads (up to a metre in width and 250 mm height) that do not require the full tailgate aperture, or else access to items in the upper loadspace when loaded above the glass line. A further advantage is that the opening arc of the glass is entirely within the plan area of the car – it can be fully opened when there is little or no clearance behind the car, as when backed right up to a garage wall or another vehicle. (The full tailgate requires the normal clearance of 400mm behind the bumper line to swing open). To avoid potential conflicts with the roof panel, there is an interlock arrangement, which prevents the tailgate from opening if the glass is already open (and vice versa)".
In common with you two gents, mine also can be open together (i.e both glass and tailgate).