That is a 2022. I can find nothing specific about the 2020 but would think they didn't completely revamp the roof in the last year or 2 (I believe the 2021 showed walkable as well).
Then there's the guideline; no roof ladder, no walkable roof and I don't believe you have one. Maybe someone has one and can chime in or use 2x2 pieces of hard foam to move around on the roof to disperse your weight.
Danny & Susan wife of 54 years
2019 Ram 3500 Laramie CC SB 6.4 4x4 4.10
2020 Montana High Country 331RL