Displacing disinfectant with CO2 from fermentation

@homebrewing Displacing disinfectant with CO2 from fermentation

Hey, I’m trying to do what the folks here did: https://brulosophy.com/diy-projects/using-co2-from-fermentation-to-purge-serving-kegs-do-it-yourself/ (with the additional mini keg as an overflow vessel)
My yeast has already chewed through a third of the available sugar and I see no movement of the liquid. Do I have to be concerned?