This is your problem. Anything that goes against your headcannon must be wrong even if the manga tells us different.
Sanji tell us he's just using hotter flames. Nothing more. He doesn't say anything about lightning or plasma. That means that "lightning" is just visual effect.
We saw the same thing when Frankie fought señor Pink.
Do you believe both of them were using lightning or plasma during those attacks? They weren't. That was just visual effect.
It's doesn't become an error just because you disagree with it. Oda has made errors in his own manga. This vivre card is just telling us ACoC is actually black even if it's drawn as purple or different colors.
Since you think I'm wrong about ACoC I will once again ask you for facts supporting your claim. Provide a scene where a character or Oda tells us ACoC is red and only red.