I don't buy the explanation given in that discussion thread. A quick googling suggests that RSI from keyboards is related to how much pressure you have to exert to move the keys, and the low-key-travel MBPs don't need much pressure to press a key. This really sounds to me like it's just anecdotes and confirmation bias (I got RSI now, it must be due to the new keyboard design, as opposed to just continued use of keyboards over a long period of time coupled with aging!)
https://discussions.apple.com/thread/7795970
https://medium.com/@mrmrs_/i-got-rsi-and-what-happened-next-...