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.
Intriguing read that mate, thanks.