Maybe it is disinformation. Or perhaps they'd already been & gone before the announcement was made. At least I hope that's the case.
Lt-Col Jones, CO 2 PARA on Op CORPORATE was said to be incandescent that the MOD had briefed the world that Goose Green was to be attacked, before it actually was. Rumour has it that if he hadn't been killed in that action, he had intended to take it further.