I hadn't thought of that, but you have a point.  It does seem unlikely that one person could have done it all in "just over a year," when "the first six months was trial and error," and the renders were "heavily post-produced."  Not to mention "Hardware was an old 2003 iMac that died during the process and was replaced by a Mac Pro during the production."

Maybe he's exaggerating slightly.  Obviously, there was some budget; he bought some models from DAZ and probably others.  Perhaps he also got the use of a render farm some way or another?