I don’t believe in the doctrine of attachment it was made up on the prequel. It exists literally nowhere in the original trilogy or the expanded universe before episode II. In fact Luke wins because he doesn’t follow what Ben and Yoda told him, his attachment to his father turns the tide of the war bringing Anakin back to the light.
You’re correct that it was made up in 2002 for Attack of the Clones. But nothing about what Obi Wan or Yoda told Luke in the OT applies to it either.