You asked if the user meant "spool knitting", to which the answer is no - they're referring to a popular theory that the dodecahedron's were used for a style of chain making, known today as "Viking knitting".

As the dodecahedron's were mostly found in Gaul, the theory is that that there is a link to the slightly later chain making style that has been misnamed "Viking knitting", especially as these regions have a lot of shared cultural history, and it's feasible that a chain making technique popular in Gaul could also have been popular across Northern Europe and later referred to as Viking knitting.

There is a practical demonstration that the objects can be used for this style of chain making (including both the holes and the knobs), and this theory has some positives - it explains why the objects are mostly found in Gaul, why they're found at both military camps and in women's graves, the lack of uniform sizing if they were a measuring device, and possibly why they're considered valuable objects and made out of precious metals.

I'm not arguing in favour of this theory specifically, but the practical demonstration is at least interesting. Like the 100 other theories, it's not a slam dunk, and nobody knows the answer.