If the video card was just "SOLDERED" on it would be upgradable but not likely.
If you look carefully, the GPU is the middle chip. Now I'm no hardware genius nor do I claim to be, but that GPU chip seems pretty set in the logic board and does not look 'removable' by any means even de-soldering it. And correct me if I'm wrong but isn't the GPU part of the graphics card and by looking at the pictures of both versions the GPU seems to be part of the logic board, not just soldered on as an extension card.
So although "integrated" may not be the technically correct common term, it's still INTEGRATED into the logic board meaning it IS part of the logic board, de-soldering is NOT an option.
Yes I know what the common reference to 'integrated graphics' means, and yes it's not true integrated, but it's still integrated by similar definition.