I did a quick search and in some cases I find a dry weight of 8600 Kg and in others 7600; ie. here
The same as Sailing World here
which has "At 16,755 pounds and with this long waterline, this Centurion 40s is proportionally lighter than other racer cruisers although still no ultra-light. Ballast makes up 36 percent of this displacement and the low center of gravity bulb type keel helps keep this boat on its feet when the breeze is up."
Checking on the Wauquiez site I see 8600Kg dry weight for the new 40S.2; so I guess you are right according to the source.
I must say I am surprised as the weight minus the keel comes out at 4800 Kg for the case of a dry weight of 7600Kg. Dont know where the extra 1000Kg is; is it all fiber glass or is Wauquiez trying to sell the boat as blue water cruiser somehow with a little exaggeration.