That's not correct. He described some of the features of the skull as "caucasoid" - he never declared it to be caucasian. James Chatters is an archaeologist and founded a firm "specializing in forensic and archaeological consulting" and in that capacity had worked with ancient skeletons, though not one that was 9500 years old, since there were only a few that were that old ever found in North America. As far as quickly recanting any error, he wrote a book five years after the discovery and didn't recant anything.
Yes your right it was James Chatters. For some reason I remembered him as two people instead of one guy with two areas of expertise. He was initially acting as a standard forensic anthropologist. The kind used for homicide investigations. He believed the skeleton was a European settler then quickly changed his mind.