I don’t think what George did with the Prequels can be considered retconing but recontextualising the story to give added or different meanings to the Originals and his Sequels if he ever made them. They were designed as the first trilogy after all. Retconing is more aligned with what the Sequels we ended up with did to Rey’s origins by changing it each film. I’d also say the Originals are just as political as the Prequels but not as heavily focused on since we’re more in the wilderness of things. However certain contexts and meanings in the Prequels carry over with it. The political situation in general is more easy to take at face value in IV, VI, and VI as we know the situation from spending more time on it in I, II, and III. Not to mention the real world sensibilities of the time it was made.