yeah, you can technically splat someone in one fully charged bamboozler shot. IF you have 4+ mains of Damage Up.
4 mains of Damage Up brings your fully charged shot damage to 99.99, which means that if your opponent is even just slightly damaged already (like from being shot at or setting a toe in your ink), you can splat them with one full charge.
i play bamboozlers quite frequently and ALWAYS wear 4 mains of Damage Up for this reason. i'd say around half my splats in most matches are one-shots.
but you can never increase your damage to 100. the opponent has to be damaged already to be one-shotted.