Spin Off Magazine highlighted shifu in their Spring 2020 edition.
Handwoven Magazine continued the fun in the March/April 2021 magazine.
In Spin Off, they talk types of paper and then how to cut them. They make lots of parallel cuts but don't separate the "threads" at first. Then they dampen the paper, and roll it. I don't understand what they mean by rolling, but I imagine every tiny "thread" is hand rolled, then they carefully pull the threads apart so it ends up one continuous thread. They are then spun on a Japanese spinning wheel. I find it hard to understand even with their diagrams.
In Handwoven, they bought paper thread and wove it into towels. They used a cotton warp and paper thread. He says it has softened with use. He puts it in the washing machine and the dryer!
I haven't tried it myself, but if/when I do, I'll see how thin I can make the strips first, moisten the paper, and see how the spindle works. I don't have a wheel!