I think that was still the explanation, but it took place several eons in the past, and was the source of the falling out between the Glukkons and the Mudokons.
This arc was far more interesting and sensible than the "lol the moon formed right as Abe escaped" idea, as it explains the origins of the respective races and would have actually made the Mudokons the jerks in the beginning, which is a cool twist.
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