Maybe someone in VMWare would like to correct the paragraph to just state that the drivers are not WHQL but are signed.
While it was easy to bypass the signature requirement in Vista/Win7 64bit this is no longer possible in Windows 8 64bit. (irritatingly you have to re-approve unsigned drivers on each boot, or use a kludge).
5 Methods to Load Unsigned Drivers in Windows 7, 8 and Vista 64-bit (x64) • Raymond.CC