True, but blue tabbies have a buff colored undercoat that could be mistaken for blue cream
My first cat was a blue tabby - thought he was blue cream till the judge told me that the buff color was natural on a blue tabby.
But if the cat has both black and red in the coat, he would be a male tortie. That's why I mentioned about double checking. Since the cat is NOT neutered yet, it would be obvious if he still had his "package"