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This doesn' t confirm Kushina could use the chains.
Whatever you say they're used as part of her seal to suppress and restrain the kyubi but she couldn't use them

Ps. She also taught Minato the Uzumaki fuinn jutsu, I guess she couldn't use them either or didn't know how to do them as well. Her chakra chains are also classified as a Hiden, fuinn barrier Jutsu.