Ask what part of the drainage was cleared and whether the disposer and its connections were included in the assessment. Free-flowing sink water does not by itself confirm that the grinding appliance is undamaged and ready to use.
What the observation tells you
Tell the person clearing the drain about any earlier stalled motor, foreign object or protective trip. Also disclose chemical treatments before work begins. Those details can require a separate appliance check even after the downstream obstruction is removed.
A useful next step
Resume only according to the advice for the actual work completed. Keep suitable food and feeding limits in place rather than testing the repair with the load that caused trouble.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.