I got a newsletter from a yarn place. I cut and pasted what they said:
“Previously, it was made of four strands of 16/2 cotton plied together. In 2022, Brassard has begun switching to a true 8/4 (four strands of 8/1 plied together) and expects to have all colors transitioned by the end of the year”
Err— beyond that description, I haven’t a clue although I hope it will won’t be stiff like Maysville 8/4 carpet warp. The newsletter doesn’t say much beyond that.