I think @naturesarchive was suggesting it as something added to the suggestion (like the current “visually similar/seen nearby” text, or the feature request for a confidence indicator), rather than saying it would prevent users from selecting the suggestion at all.
If you meant “impossible to ID” might convince people it cannot be IDed from photo, though, I apologize for misinterpreting you. Maybe instead of “impossible to ID”, the wording could be something like “often difficult to ID based on photos alone”…but more succinctly, because even though there’s a bit of white space on the suggestions, it’s still limited real estate.