That is why it does not (should I say it should not) matter in a competition. An experienced judges knows not to give a higher appearance score due to this very reason! The photo in the article looks like it was induced to me, it is not a natural smoke ring color!
If natural smoke isn’t giving you the ideal ring, there is a way you can cheat. A dusting of pink salt or any curing salt with sodium nitrite (one common brand is TenderQuick) in it will produce the pink color you’re looking for.