So does the game really support it ?
No, it does not.
I've checked final version (Reloaded) personally, and it has only standart CPU PhysX content, like ragdolls.
or it is just a mistake on NVIDIA's part ?!
One day Deep Black was promised to have PhysX support (that's when it has appeared on NVIDIA website) but ended only with CPU physics.
NVIDIA does not have a dedicated person who checks and renovates all PhysX ralated info on all websites (like we are trying to do on PhysXInfo), each region has its group of managers and webmasters instead, thus some info may be incorrect or obsolete.