Only feed hard food items when the exact model's instructions permit them, including any size or quantity restriction. There is no reliable rule that every domestic disposer can accept bones or fruit stones.
What the observation tells you
A claim about one manufacturer's advanced grinding system does not establish the capability of an older or differently designed unit. Hard items should not be used as a way to clean, sharpen or test an unfamiliar disposer. A sudden impact sound after such an item is a reason to stop.
A useful next step
Use the food-waste bin when compatibility is uncertain. Preserve the model number and a description of the item for service advice.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.