Yeah, but anytime anyone says anything, they’re making an implication about their beliefs. Even if we don’t call them “political”, they’re still technically beliefs. For example, a tiny bit of “Elan” says “have a laugh at the orthodox!” as part of an encouragement towards adventurous actions and thinking. That’s a statement, an implication of the writer’s beliefs.
Furthermore, let’s say Nightwish lyrics told actual little folk stories. There’d be no politics in that song about how the husband and wife are adventuring, or about how the woman’s child died and they’re mourning them. So nobody’d get upset at the lyrics for actually having basic coherency.