None of it has really been retconned for AOTC. It was the Essentials Guides that retrconned all of those Boba Fett stories, saying that they were all "false stories Fett spread about himself to keep his past a mystry." The Essential Guides then say that AOTC was his actual history. But, of course, you can take it any way you want. Sense you don't like prequels and probably don't consider them part of your personal canon, you can simply ignore the Essential Guides, and enjoy the old Boba Fett stories for what they used to be.