So another retcon, which like all their retcons seems to only show up in peripheral materials they want you to buy to understand all the things they left out of the Movies that don't make sense without them.
Well in defense, plotholes requiring further explanation (retcons), it is a tried and true method of merchandising and marketing, pioneered by the Star Wars franchise, no less. What is surprising, is how aggressive or lazily Disney has done so with the recent trilogy. There are too many to be happenstance, and yet so poorly executed to be excused or tolerated for an established IP; and thus must be intentional for tie-ins, e.g. books, comics, shows, etc. one would think? Conversely, some mystery should be expected, something not new to Star Wars, and makes for better storytelling than straight exposition, but there are limits for good storytelling. IMO. I believe Disney simply underestimated the task before them. The blanked out everything preceding (40 years of material), consigning Legends to the shelves prematurely.
What Disney needed to do was keep Legends, slowly role in their retcons over the next decade, using the movies too slowly introduce their main plot/universe anchor points. Once they had 'enough' of their own material, then soft reboot, peeling away the portions the didn't want, but leaving enough material so it was a seamless transition. Then they could always hard reboot, for new stories. Instead they hard rebooted first, and now what fans know is faulty or wrong info leading to confusion and raised eyebrows. With the proverbial... "Wait, what happened? That's not what I remember?" Which contributes to the disjointed nature of the movies.
So long as fans are willing to read about Wedge's new story or dig to find out what happened to Leia before the Rise of Skywalker, Disney is good, but Disney may have started counting revenue and patting themselves on the back a little too prematurely. There may be a lot of Star Wars retcons in the near future given the 'looseness' of the current story-line. Something now required, as opposed to nice filler material.