No. Routine scale care and an obstructed or malfunctioning unit are different situations. An approved descaler is not a universal unblocker.
What the observation means
A full or non-draining system should not receive extra liquid merely because maintenance is due. The actual fault and overflow risk take priority.
A useful next step
Stop using affected fixtures and seek assessment when clearance is poor. Use descaling only under the exact model and product instructions in a suitable normal condition. Do not mix products or increase concentration to make routine maintenance act like a repair.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.