Or was it on purpose?
The weird quality of the footage they used tells me that British Media outlet ITV
a: are trying to fool their viewers by making the video as unrecognizable as possible.
b: were fooled themselves.
Either way, the fact that it says “IRA film 1988” shows that the viewer is supposed to think this is real. To the trained gamer-eye it really seems weird that anyone would mistake this for reality and not question it, but from this it seems that non-gamers might actually not be able to tell the difference. It’s just a really weird way for video games to make it onto TV.
In case you were wondering: The game used to film this is ARMA 2.
Update: Looks like the video has been removed. Kind of ruins the story. Sorry about that.