I was gonna say the same thing. Most waitlist movement doesn't even happen until after April 15th anyways, so posting now doesn't make sense (if that's still the deadline, I'm very out of touch now).
Off topic, but I read through that thread for nostalgia and noticed there's a disclaimer at the bottom discouraging people from necro-bumping now
Anyways, I think interview waitlists are ridiculous. How many people could you possibly waitlist for an interview, only to give them a call for declines/no shows? It really can't be that many, can it? I'm thinking it would be like 30-50 people on the list, but maybe I'm horribly wrong. Generally speaking, most applicants don't decline interviews. It just doesn't seem practical to me. If you want that cushion, just interview these people anyways.