I don't think they stopped making them, i think that brass is just getting very expensive so they are having to find other alternatives. But there are still brass KM's floating around.
Those say "Brass Heart" which could mean 2 things. One, the heart is fully made of brass. Two, the hookah is brass cored. Or it could mean both. But either way, any amount of Brass in a KM just makes them that much better. And those hookahs already look gorgeous.
I have never seen KM stems like that before, but i would say that even if they were fake, they still would smoke great and look great.