Instead of trying to bend the existing definition of Endemic to an interpretation that does not fit its current very plain language, I suggest that you submit a Feature Request (using the required template) to change the language of the definition to something like, “native here and nowhere else.” Then the community can properly debate the pros and cons of the proposal, and the iNat staff will perhaps weigh in with a decision one way or the other.
Otherwise, debating it here will likely just encourage different users to apply Endemic establishment means inconsistently throughout the site, according to their personal favorite “interpretation.” Unless and until iNaturalist staff agree to make a change, I think we all need to follow the plain language of the current definitions, and not read anything else into them:
