As stated, this is about sucessfully persuading Gorsky that it is impossible to find the key card, i.e. the player was not able to find it despite scouring all 3 levels of the building.
The dialog option popped up when I told him that there are civilians held captive by raiders on the lowest level
before I retrieved the key card. Not sure whether one has to actually find out about that in order for the dialog option to appear, but that is not the point anyways.
What you described is a different scenario, in which you had already found the card and handed it over to Gorsky by the time you attempted to persuade him.
Edit: By the way, this bug isn't exactly new. There has been a Steam discussion regarding this very issue ->
http://steamcommunity.com/app/250520/discussions/0/527274088399764195/Granted the people in that thread had already found the key card by the time they talked to Gorsky, but they are referring to the same persuasion option (prompting the same result when successful).
