The fact that is says it keeps the shutters closed longer to aid in engine warm up makes it a feature, not a side effect. I'm not arguing the primary function is aerodynamics.“Additional benefit” is synonymous with side effect. There are good side effects and bad side effects. Obviously, this would be a good side effect. But not its main purpose. That was stated in the first paragraph highlighted.
On a side note, shouldn’t a moderator help enhance forum users experience positively instead of driving users away from using this forum? It’s a rhetorical question. No need answer.