This could be a fake as well, just go to Aliexpress and search for delihea DHCBF-RF15. Looks identical to the 'real thing'.
There is really no need to buy a fake De Rosa anyway because many folks new to cycling haven't even heard of De Rosa. This works out well for us consumers because most bike shop owners HAVE heard of De Rosa. So, they stock them on the basis that a certain Belgian gentlemen used to ride one... and they don't sell. They are usually eye wateringly expensive, not ridden by a world tour team, so people wanting something Italian buy a Colnago or Pinarello instead. So they sit there until you just walk into the shop, do some negotiating with the desperate owner, and pick up an elegant piece of Italian/Taiwanese craftsmanship for a fraction of the new price. My King RS is not super light at 7.2kg all up with alloy tubeless wheels and steel pedals, but more importantly it looks beautiful and it is a great all day bike. Up hill and down at speed and in style and comfort, measurably faster than my old bike, and with great road feel. And the frame cost me less than 30% of the new sticker price (yes it is real). If you actually want a beautiful bike to ride, and you don't need the latest latest gear, I'd recommend last years' De Rosa to anyone, you just need to do a bit of searching!