The throat singing in this scene is performed by Michael Geiger, and I found a video interview with him, usefully chaptered in the notes under the video. It gets right into the technical stuff of both recording the piece and the operation of the vocal system in achieving it.
I actually sat forward, the first time I saw this bit, saying, “holy shit, that’s Tibetan throat singing.” I love this bit so much. Probably my favourite part of the film, both visually and sonically.
There’s an excellent BBC documentary about Hans Zimmer, who composed the DUNE soundtrack, saying of it: “I don’t think anybody’s ever won an Oscar for a score that blatantly is bagpipes, heavy metal guitars and a woman screaming at you.”