Yes, that's confirmed.
"In late September, Google released a compression algorithm called Brotli and gave files it makes the extension “.bro”.
But last week the extension was changed to “.br”.
The reason for the change is threads like this one, in which posters suggest that “'bro' has a gender problem” and “comes of[f] misogynistic and unprofessional due to the world it lives in.”
http://www.theregister.co.uk/2015/10/11/googles_bro_file_for...