Rotting is rare in healthy plants. They are weakened by improper temperatures, light levels, humidity and watering. Algae are also photosynthetic, so they need light. They don't penetrate plants. Many orchids are moist to wet throughout their growing seasons. Their roots are exposed and well-aerated so this is not a problem.
Now that I see the photos, your plant was normal and healthy on arrival. All the roots and leaves you cut off were normal and healthy. Orchids grow slowly. The plant was probably blooming size on arrival. It will take several years to recover.
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