This maybe the cause for the confusion - article below talking about the 2023 model refers to the changes on the new bike.
This is describing the changes made in the new Rocket 3 2020 - but could be easily be read as though it was for the 2023 variants.
As Whylee has pointed out the 2023 model has some cosmetic changes but nothing substantial. But don't worry about that - it's a fantastic bike already!
"The Hinckley firm went back to the drawing board, and came out with a revamped Rocket in 2020 that dumped the cruiser design for a much-improved roadster style, now designated the Rocket 3. Engine size grew to 2,458cc in addition to dropping more than 40 pounds (!), and the old steel twin-spar frame was replaced by an aluminum backbone chassis. That chassis is significantly smaller and 50 percent lighter with a single-sided swingarm incorporating built-in shaft drive; in all, the Rocket 3 scales in nearly 90 pounds less than its predecessor. Showa suspension is fully adjustable at both ends, and there’s suitably fat rubber with a 150/80-17 front tire and a 240/50-16 out back. The amazing result is a monster roadster that not only goes like hell in a straight line, but can also carve twisty pavement far better than you’d think would be possible for a 675-pound-or-so bike."