A few years ago I copied and pasted the Daily Dish from the official South Beach website that stated shirataki noodles are perfectly acceptable in Phase 1 because they are mainly fiber.
The "yam flour" in the ingredients is just another name for glucomannan, which is fiber from an oriental tuber plant.
I plan on using it in Phase 1. If you'd like I'll try and find my copy and pasting of that article into word. It's been a few years. Let me know if you want it.