Laddie Alien Reference?

[NMLevesque]

"With the help of Laddie (and IN = 10), you can have a very interesting conversation about pre-War times and aliens."

http://fallout.wikia.com/wiki/Jonny_is_missing._Find_him_and_bring_him_home_to_Balthas

Couldn't find it in game. I checked Johnny, Laddie, and Bathias dialogue files too but found nothing. Any clues?