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No.Except it is not, in fact, claiming that.
Luffy gains no boons or increases to his ability, he just doesn't make sense according to Type Moon humanity's science, ergo he is considered to have Mystery. The only way you could have that not happen would be to put them somewhere where humanity just doesn't exist and can't judge them, but then a) Artoria would not have mystery either, and b) Artoria would just die, because Servants can't manifest in places where humanity doesn't exist at all.
Rather, this is like claiming that somebody who has a weakness to the supernatural in general, will in-fact be weak to a tier 6 boy made of gum who was made to shapeshift into a sun god by a magical fruit.