The only geometry the knitting demonstrations justify is "pins around hole". I don't see an argument for the dodecahedron shape or the cast metal. A vastly cheaper wooden jig with nails would service just as well and offer much better ergonomic possibilities, like a handle. The knitting with the finger growing inside the dodec looks unhelpful and implausible.
Unnecessary complexity & expense, and if it were part of a mass production process you'd expect to find them clustered in production centers or something. These are found scattered randomly and individually in graves and border forts.
The only geometry the knitting demonstrations justify is "pins around hole". I don't see an argument for the dodecahedron shape or the cast metal. A vastly cheaper wooden jig with nails would service just as well and offer much better ergonomic possibilities, like a handle. The knitting with the finger growing inside the dodec looks unhelpful and implausible.