Gnome Artificer’s Lore – Does mean you have to have proficiency in order to get the double prof?

@Gutzindaffer @mikemearlsGnome Artificer’s Lore – Does the wording mean you have to have proficiency in order to get the double prof? A gnome doesn't need proficiency in History to benefit from that trait.

— Jeremy Crawford (@JeremyECrawford) July 18, 2016