How do you know? Did she call you and tell you?
Because I used my brain.
Just because a few people said that it was chakra arms, doesn't mean it is. New info proves otherwise.
It's the same way that during first release many people, including me, thought madara used some sort of susano'o technique or the like to control his sword
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. Well, that's false. with the revelations of limbo, it's obvious that the limbo clone picked up the susano'o sword, cut the chains, and whacked gaara.