Cleaning changes surface condition; it does not automatically restore failed underlayment, attachment, or flashing. A cleaner-looking roof can still need repairs. A proposal using the word restoration should identify the physical work behind that label.
What to do next
Ask what defects the service addresses and what it leaves untouched. Confirm that cleaning methods suit the tile manufacturer's guidance. Keep any inspection findings and repair recommendations separate from aesthetic cleaning so the result is evaluated fairly.
Related Perkins guidance
Contact Perkins Roofing to discuss your roof and the appropriate next step.