I’m going to assume that the 2019’s are back in that 5% range if the 2017’s where that much improved. We don’t know the real numbers only Apple does.Do you recall where you saw that? Those numbers don't sound right. I can't imagine any of those models would be that high, even the failure prone 2016.
If the previous generation MBP's were anywhere near 6%, we would have had a mass of people complaining back then, as they are now. Even the 11.8% for the 2016 is just too high. Over 1 in 10, Apple would have halted production.
https://www.laptopmag.com/articles/apple-macbook-keyboard-failure-rate