Visible lint suggests that the outlet and maintenance arrangement deserve attention, but it does not reveal the condition of the entire duct. Use the exact model's maintenance guidance.
Understanding this situation
Access may involve height, wall fittings or a long concealed route. Do not undertake unsafe climbing or push debris farther into hidden ducting simply to clear what can be seen.
A useful next step
Arrange appropriate cleaning or assessment where needed and keep the dryer unused if airflow is obstructed or it overheats. Explain the lint location and drying change. Do not interpret a cleaned outer grille as proof that every internal passage is clear.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.