Hi guys - I contacted Cathy (the person who coordinated interviews) last week, and she informed me all initial offers went out on the 19th and that I was waitlisted. So you may want to reach out to inquire as to wether or not this is the case for you as well!
I spoke with someone who already recieved an invite last week, for my PI, and she said that they were planning to send invites out into this week as well. I also got this email and had already written them off, so not quite sure what's going on. I'm wondering if they're doing review in some kind of alphabetical order or something lol.