Shantae looks like she's trying to convince herself that her being a spirit actually means anything besides her chances for DLC getting killed.
Oh and about the spirits deconfirming fighters thing...
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Fighter Sprits are separate from Normal Spirits and can't be equipped to fighters, meaning they can't just change an existing spirit to a fighter spirit if they end up being DLC, so Shantae HAS been deconfirmed after all.
But there might still be Smash 6/7! If we want a chance, then that's where we shoot for!