One day isn't long for it to be under review, so I wouldn't worry too much about that!
Dean Maher (she isn't the only one who conducts the interviews - there are a few others who do it too!) said at the start of the interview that they only interview people they are genuinely interested in admitting, so I presume that they interview the majority of people who get accepted. That being said, it does not necessarily mean it is a prerequisite to being admitted!
Hope this helps :)
Thank you! :)