This is a bad explanation of the dodecahedrons for several reasons:
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Where the dodecahedrons are typically found - not broken or heavily worn in waste piles as you would expect if this was an everyday object used for practical purposes, but with money and other expensive objects. They also rarely have any signs of wear.
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The size of the dodecahedrons isn't suited for making anything large enough for an adult, which seems kind of useless if it's meant to be a knitting tool.
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Some of the dodecahedrons have no holes and can't be used for knitting.
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Knitting did not exist for almost 1000 years after these dodecahedrons were made. Knitting is a technology that hasn't existed throughout all of human history.
I don't want to rain on anyone's parade, it's just important to note that we still don't know what these objects were for.
Edit: I have also never known any historian that wouldn't immediately launch into way more detail than anyone outside the field cares about at the drop of a hat, haha.