The only reason IW did worse than Ghosts overall is because Ghosts was available on 3 more platforms. Those 3 platforms account for most of Ghosts sales.
The only numbers we have are VGChartz, so we’ll have to go by those. According to them, Ghosts sold just 7.9M across PS4, XBO, and PC. Also according to them, IW sold 13.51M across those same 3 platforms.
Now I don’t doubt that IW is also dead, I agree with you, but on current platforms the game sold better than Ghosts.