No,it was the thoroughly illegal “mail in voting” that was responsible.
I think Navarro is saying Jared was responsible for overseeing the election issues such as mail-in voting and that he did a bad job which resulted in rampant problems which resulted in the loss.
And Kushner didn’t do a thing about it. Bannin would have fought and had lawsuits flying long before Election Day. Javanka was the worst thing about his presidency. They believed it was possible to reach across the aisle.