I actually made a thread about this, and the whole 1977 “interview”, a few years ago, and I wouldn’t put too much faith in anything claimed in it. Turns out that Lucas tampered with that interview when it was printed in the “The Making of Star Wars” book in order to make it more compatible with the PT.
What’s interesting though, is that this version of Threepio’s origin was eventually canonized in a comic. So in Legends canon, Threepio was never actually created by Anakin, but rather just rebuilt.
Very interesting and thank you for sharing . one thing of note is that I have the 2nd edition of A Guide To The Star Wars universe by Bill Slavicsek from 1994 and for the entry on 3po , it does mention that he was built 112 years bby , I don’t remember if it mentioned Affa or a junk dealer though . I will have to dig all of my books out of storage when I get the time , but I remember being surprised that 'ol Goldenrod had been around that long when I read that entry back in 94