Nope, very clear... She talks how square waves produce harmonics that spread through a good chunk of the spectrum therefore no need to have the exact frq ala zappers, while a sine wave FG "must" have the exact frq.
I do this all the time; when I know Bartonella is bugging me and the EMX doesn't take care of it I use the F165 as a contact device and running the Bart frqs with a pulse and a carrier wave (same frq 11 octaves higher). This not only kills the bart but also kills unknown pathogens with the large harmonics produced.