Maybe it’s the way I wrote it above, but I was referring to the groupings of three not the base. Braille is written in two columns with three rows each, i.e., 2^3*2^3=64 So, using two groups of three. I’ve also written a post on this forum on how to use your binary system to learn Braille if you want more details on it…
As far as the history of Braille… that was invented by Louis Braille, but was influenced by something similar to what you mentioned. Details here: https://hankeringforhistory.com/napoleons-influence-on-braille/
I don’t think it says anything about humanity. This was an order by Napoleon himself. It’s not like humanity as a whole wanted to be able to read and write undetected by the enemy. Just to be fair to humanity.