I agree that a possessive concept shouldn’t be used as a generic. I’m sure mistakes of that nature are made all the time by non-speakers of various languages.

Neither person in the discussion above claimed bahasa means “our language”. The positions were “bahasa=language(generic)” vs “bahasa=also colloquially used to mean Indonesian”.

It was your assertion/conjecture that it actually means “our language”. The (seemingly) native speaker posting the original comment did not make a similar claim.