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It only works on the deeds granted by Kata Master. Any other deed gained from actual swashbuckler levels or any other source that grants deeds do not apply, and have to meet the actual requirements of the deed.
As mentioned, Snake Style, Boar Ferocity, and Hamatulatsu allow you to treat your unarmed strikes as piercing and thus work with swashbuckler deeds.
For a more murky solution, you can use a cestus or emei piercer to change your unarmed strike's damage type to piercing. Note, you are not actually using these as a weapon. You weapon is your unarmed strike, and any materials or enchantments on this will not apply, you are only using it for the line that it changes unarmed strike damage to piercing.