I watched it but I really don't recall it ever being stated that Piccolo was THE DEVIL just because he was the evil half of the guardian of the Earth. If you can point me to where it was indeed stated, then sure. Otherwise it's merely a conjecture of yours, since I don't think you're capable of reading Toriyama's mind and knowing what his intentions at the time were.
And even if Piccolo were THE DEVIL, since when does the devil have to be from the Earth? Hell is another world altogether in Dragonball, so technically he'd still be an alien regardless.
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