Of course, from the URL, it is a tutorial at a Halo Custom Edition modding/mapping site. This is where I have been lately (I actually have been able to put modeling tools to good use there). While I was looking through tutorials out of boredom, I found this tutorial near the top of the Halo Custom Edition Tutorials list. The main thing I noted, though, was what looked very much like MetalBeast's PyroGX.
Title: Custom Flying Vehicle Tutorial
Author: Doug /Nero the Great
Description: This is a tutorial on how to get a custom flying vehicle into Halo CE. This also includes Side Notes and a few minutes of final gameplay.
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Then, I just looked at the readme file.
Interesting: it is indeed Metalbeast's PyroGX model:
I only ask \"whodunit?\" because descent seems kind of... well, like one of those games no one looks at anymore, but those who did so stuck with it...I would like to acknowledge Metalbeast for the creation of the model, and Parallax, Outrage, Volition, and Interplay for the creation of the original Descent content.
...that, and I have been fooling around with making the player fly in Halo CE.
EDIT: and the video features the descent font, how lovely.