Or its a behind the scenes photo.
The original script for D42: “Darth Vader and the regional Governor Moff Tarkin stand before a huge screen that shows a million stars. Admiral Motti and General Tagge are standing with them.”
There’s a number of reasons why it might have been cut, but considering the other images from David West Reynolds’ article are clearly screenshots, we shouldn’t rule this out.
Actually I think you’re right, this photo is taken from “The Evolution of Star Wars” by David Reynolds (in the famous The Star Wars Insider #41 where The Lost Cust was detailed).