In general, for issues with a species listing or status, please flag the taxon itself on iNaturalist.org. You can explain the issues as you did here and a curator can look at these and help change as appropriate.
In this case, establishment status can be changed by any user, not just a curator, so you can fix any errors with this yourself.
There’s some info on how to do this here: https://forum.inaturalist.org/t/establishment-means-corrections/1780
but you can also search for other threads.