But would it still look like one if a DJ played it?
I haven't seen a whole lot of DJ/Mixologist's since I'm not a fan of the genre, but the ones I have seen or watched videos of weren't using an instrument to play melodies, harmonies, chords, arpeggios or leads.
They were triggering loops, samples, drum tracks, etc. They weren't "playing" anything. I wasn't able to get through more than a few minutes of the clip Josie posted because the music was so obnoxious, so forgive me if the guy pulled out an instrument like the Linnstrument and actually "played" a song later in the clip.
If a DJ/Mixologist triggers his backing tracks and then pulls out an instrument and plays melodies, harmonies, chords, arpeggios and leads over those backing tracks, then he/she is a Musician/DJ/Mixologist and will probably stay as busy as he/she wants to as a professional performer.
As John cubed so sarcastically called it, they'll enter the "tree house" of the musicians if they actually play an instrument during their performance. Even if it's an unconventional instrument like the Linnstrument.