I think it is slightly different than that. I think it is more about active brain activity versus passive. Learning how to play Riichi Mahjong (e.g.) would likely show a similar effect. A lot of people push brain puzzles as a tool against dementia, etc. but it is only helpful when learning a new puzzle type. Once you over learn it, our innate pattern matching takes over and you start playing on auto-pilot, it stops "rewiring" your brain. Just sitting on the couch binging streaming or swiping through shorts is likely to atrophy your brain.

Obviously being out in nature has other mental health benefits. The key thing is to keep learning and stay curious. Drive to some new nearby town on a weekend and learn about its history. Learn a new hobby like full f-stop photography or learn how to bake or cook (learn all four base sauces). Take up board games and explore all the different kinds of experiences they provide today.