There are many Spanish speakers ... who don't truly know their own language
Of course there are not. They may not know whatever it is you are talking about, but it's tautologically true that a group of people communicating with a given language know the language they are using to communicate (the language that they would likely refer to as "their own language"). I guess no one will care if you don't want to call that language Spanish (they won't heed your opinion, they just won't care).
Of course there are not. They may not know whatever it is you are talking about, but it's tautologically true that a group of people communicating with a given language know the language they are using to communicate (the language that they would likely refer to as "their own language"). I guess no one will care if you don't want to call that language Spanish (they won't heed your opinion, they just won't care).