This is a good instance of an article that might be paid for by the team of the cryptocoin being advertised. We all know that all of the forks of bitcoin will either be done by scammers to find a way to make a quick buck, or it is politically motivated.
In any case, scamming by forking bitcoin is easier to do than organizing an ICO.
I wouldn't be too surprised if this would turn out to be a paid telegraph by the bitcoin diamond team. Since cointelegraph has quite a big reach in the cryptocommunity I'm most certain that they get a lot of offers for paid articles.
Is bitcoin diamond better than bitcoin?
No it isn't. It's just another altcoin trying to be bitcoin and stealing it's brand (that's the annoying thing about open source, in theory everyone could create their bitcoin fork. The public will realize this after dozens of forks). This one will surely fail in the long run and I'm sure all the forks that follow will suffer the same fate.