Braille (the concept) is not a typeface, just like the concept of representing certain sounds by pictures on paper is not a typeface.
Unified English Braille (the specification that maps dot combinations to English characters) is not a typeface, just like ASCII is not a typeface.
I Ould argue, however, that a specification like Marburg Medium[1], which specifies how Braille should be represented physically, how big the dots should be, how far apart they should be spaced etc, is a typeface.
[1] https://www.pharmabraille.com/pharmaceutical-braille/marburg...
