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The TankRenderInfo class just tells the rendering code where the tanks are in the model and which faces of the fluid AABB to render. That bitset is just a compact way of storing which of the 6 faces need to be rendered; the FastFluidTESR class is abstract and implemented by the renderers for various tile entities, each of which have differing rendering requirements (e.g. some only need to render the top face of the fluid, some need to render the sides too since the block model has transparent sides, and some have multiple tanks to render, like the Refinery with both an input and output tank). You don't really need that extra code if you're only ever planning to render the top face of the fluid.