Consoles do support 16:9 aspect ratios (in fact they are most commonly used at 16:9), so I'm not quite sure I see why a console port in particular wouldn't support 16:9 on a PC.
I know that; but the developers might assume that PC gamers won't run at 16:9 and will only allow the program to support 16:10. That'd be rather short-sighted of them but I wouldn't be very surprised if it happened. Though nowadays developers will probably choose to only support a certain aspect ratio under the justification that they have to "level the playing field".
Heck, I remember when FreeLancer came out and I was rather surprised at the lack of 1280*1024 support even though it was a common resolution at the time. The game strictly supported only 4:3 resolutions and it was a PC exclusive.