Executor Missions Jackal (Zombie): Objective 4 Kill the Horde (Call of Duty Black Ops: Cold War)

Good day. In the mission of the performer Jackal (Zombie): goal number 4 is proposed to kill the horde. I thought that meant a side mission in Invasion, when the body of a soldier turns on the radio. Because, after that, zombies appear, after the killing of which it is said that this horde will no longer interfere or threaten, something like that. But I destroyed it, but the task did not count. Was someone doing this assignment?