If you are referring to the same one ORA breeds I have never seen them to pick polyps (any fish can if it decides too) and they are quite small so I doubt they would do much damage. They are a parasite cleaner and IME seem to setup a cleaning stations (which might lead some to believe they are feeding on coral where they land) also they can adhere to surfaces and that behavior might look like feeding as well.
In this hobby you can literally here just about anything, but I think with these guys you are safe
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