Yes, bronzing is quite common in Basenjis and often it is mistaken for possible beginning of PRA. I had a bitch like that and so was her son. You need a good eye specialist that understands and knows the breed.
So, yes, that is good news for your boy….. especially seeing there is PRA in his pedigree (and my bitch & her son carried some of the same dogs in their pedigree so I am quite familar with the bloodlines)