The article you link seems to talk in circles and dwell on the question of whether covid-19 came from that lab, but I don't see where it explains what definition of 'gain-of-function' Fauci is operating under, if not,

> gain-of-function — a type of research the U.S. government generally defined in 2014 as aiming to “increase the ability of infectious agents to cause disease by enhancing its pathogenicity or by increasing its transmissibility.”

What does Fauci claim the meaning of gain-of-function is, which excludes "take an animal virus and you increase its transmissibility to humans"?