I think that some people are getting a little too uppity here... His plants, whether they live, die, or sprout wings and fly to the moon is his business. Sure, it's okay to give growing advice, but some people are being kinda harsh. If his rare plant dies he'll research more before he tries again, if not, people should be happy for him! If it IS an "Eden Black" then there's a source in the US and another way for people to get divisions. If it isn't, but looks exactly like one, who cares? As long as he doesn't try to sell or trade it as the clone then the cultivar status is just a title and means nothing; it's still a nice plant with the same features. Of course, if he is trying to sell/trade it, he should provide proper documentation, as expected with any rare/questionable plant transaction.
I'm not really sure what people are trying to get to, are you trying to prove it's not even his pictures, it's going to die, or it's not a real "Eden Black"? The last one only effects you if you're buying it from him and the first one you should just ignore. Personally, I like the cephs regardless of whether they're "real" or not, and ceph lovers in general should too.