I think that the SOLO film was Han’s origin story, if Han himself was telling it. It’s not exactly the most accurate retelling, after all, it is Han.
When we met Luke for the first time, he was an adventurer-to-be stuck in BFE. He had seen the world. And it’s full of sand. Everywhere, for as long as he can remember, sand. No trees, much less lush forests. He has never seen his reflection in a like. There is nowhere else to look, but up.
So he must’ve bugged Han on that first fateful trip. Bug-eyed and full-of-stars, Luke must’ve been in total geeked-out “Where did you get this ship? Why is it funny-shaped? Where are you from? Have you ever met anyone famous? What’s it like adventuring among the stars? Have you met bounty hunters? You KNOW Jabba the Hutt? How’d you meet Chewie? Are you like a pirate captain? Did you have a crew? What’s with the dice? Is it true what they say about (insert pretty much anything that comes to mind, every other sentence)??” I figured, with such a long haul ahead of them, Han eventually wore down, and started to tell a few tales, to shut the kid up for a minute. Farmboy hick seeing more than just sand, for the first time in his entire life. So why not mess with the kid a little, and feed the ego while he’s at it?
In that context, SOLO feels like the stories Luke would have told a young Ben Solo, whenever he asked about his Dad, like any kid with their pop’s brother. “Kid, let me just tell you about ‘General’ Solo. Your dad was a much MUCH different person before the war. Really? Hasn’t he told you those stories of his? Wanna hear some?”