I really was not clear, sorry. Nathalie Jeremijenko was not the artist who had the video. She hosted a seminar where a sequence of artists gave talks. One of these artists presented that video at the seminar.
I really don't see how it could have been a hoax. Computer art and animation was my thing at the time, and I'm pretty sure I would have noticed a fake. 20 years ago, computer animation was pretty good, but it was a rare few who could make truly realistic renders and composit them into recorded video. Not that guy, for sure.
Natalie Jeremijenko hosted the seminar, but was not the artist who played the video. Yes, I saw the video. IIRC, it showed the plane passing low over the Potomac seconds before it hit the Pentagon, just out of frame. I don't see how that could have been a hoax.
Sorry, I tried to be clear. I did see the video. The artist had it online behind a password-protected web page. He went to some URL at his own site, put in a name and password, and played the video. Some of us asked him how we could see the video again, and that's when he told us that it wasn't "public", that he wanted to hold onto it until he could figure out how to best present it or whatever-the-fuck ever.