Date of sermon is Feb 15th, Feast day of Saints Faustinus and Jovita.
Fr. Hewko does clearly say Faustina, but I think it is a verbal blunder. There are 364 other days of the year that his detractors could have made this accusation about Faustina Kowalska believable, however, Feb 15th is not the day to do it.
I myself said the same mistake that day during my family rosary with my children, I said Saints Faustina and Jovita pray for us.