No. The absence of conventional knife blades does not make moving grinding parts safe or remove the possibility of sharp objects inside. Never put your hand into the disposer opening.
What the observation tells you
Manufacturer explanations of how a grinding plate and surrounding mechanism work describe the process, not permission to touch it. A dropped piece of glass or metal can remain hazardous even after electrical isolation. Protective accessories and proper operating controls still matter.
A useful next step
Use the approved owner instructions for care and leave inaccessible objects or faults to an engineer. Keep the same hand-clear rule when demonstrating the appliance to anyone unfamiliar with it.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.