I don’t think Hamill has actually changed his mind on “Jake Skywalker”. He’s continually maintained he disagrees with Ryan’s take on Luke, and to this day views him not to being entirely consistent with the Lucas era Star Wars. However, he’s also maintained it’s no longer about that era and those heroes, and that Luke had to be this way for Ryan’s story to work, and has praised the film. So, it appears he feels TLJ is a great film, and necessary for taking Star Wars in different directions AND still disagree with the way Luke was depicted in the film if he compares that version of the character with Lucas’ version. He simply didn’t want his criticisms of Luke in TLJ be taken out of context, or used as some indication that he hates the film.