I interviewed 9/17 as well and just got this email. The wording confused me as well and I was kind of confused on how the seats were full. If you could please let me know what your friend finds out as well.
Honestly was just like a conversation with the interviewers. They were all super friendly. I had 4 people in interviewed with and then at the end you have a writing prompt. No worries, everyone is super sweet.