…Wait a second why did this even get permitted with those vocals? I mean sure I can’t make out what they’re saying but still!
To give an actual answer to this, I only banned songs with lyrics because if they were allowed (and if some ended up being nominated), I'd have just ended up drawing whatever the song's lyrics were about. Take Escape from the City for example, I don't think there's any way to draw that song and have the picture not involve a city in some way. And by itself that's fine, but it's sort of against the spirit of the topic.
As for why I didn't raise the issue for Namek's Destruction (and two others)... eh. I didn't think it was a big deal.
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"The courtroom is the garden of holy judgment. Those with lechery in their hearts should leave this sanctuary at once!" ~Franziska von Karma