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Yes linguistically that’s what the those two words mean.
But in the context of a messaging app, “Multi device” becomes one singular term with a set meaning agreed upon by everybody but you, that you’re trying desperately to change by deconstructing the words it’s composed of in order to misrepresent something that you evidently like a whole lot.
By “everybody but you” you mean just you, right?
No I mean me, the other people who’ve corrected you, the people who’ve downvoted you, and everyone else.