It turns out there is another who works in the style, a composer named Robert Kyr. I am listening to a CD of his new chant influenced sounds for a capella chorus, in a CD appropriately named All Night Vigil (Capella Records Super Audio CD with Stereo and Multi Channel Options CP-426 SACD). Capella Romana take care quite beautifully of the performances under the direction of Alexander Lingas.
The style lives with some sonorous drones, extended sustains, deeply full choral outlays and deeply meditative sobriety and jubilation, plus the welcome thickening of the palette nicely with more modern harmonic densities at times, more than we would hear in the traditional form.
If you approach the music with no particular expectations, and if you are like me, you resonate with the primalities of possibility in archaic and post-archaic tonalities through the ages, well here are some beautiful new examples I suspect you will take to.
So this one is mostly self-selecting. If you think you will like it, then trust your intuitions, if not, not. Bravo for the vocal excellence, the great audio and the finely crafted honing of the Modern in the Archaic.