The statlines for the shielded missile drones appears also in the riptide's entry - when they are purchased, they are additional squad members for that unit. They move, shoot, can be targeted by precision shots, can take wounds, make saves, fail saves, and be killed.
Look at a unit from another codex - Dark Eldar Beastmasters. The unit composition is 1-5 beastmasters, which may take up to X of kymera, clawed fiends, razorwing flocks. These too are optional models, that when purchased, count as additional models to a squad.
A riptide, just because it has the option to add models to the starting unit (by taking drones) fulfill's the main rulebook's rules for whether or not an Independant Character (or multiple independant characters) can join the riptide.
It just works.
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