Can you tell me where you learned this? I'm honestly curious. I've never heard of, nor seen a buff about Cursed Hidan past the 2.0 update.
This is Cursed Hidan as he is now, in Global:
This is Cursed Hidan as he is now, in China (I just used Google Translate):
Apart from the horrid translation of the latter, the two look exactly the same. If it's just a matter of his damage being buffed, without any wording being changed at all, I apologize, but I strongly suspect that isn't the case.