Could Wladislaw get some of the information wrong? Possible. How soon did he naturalized after arriving to America. Easy to get few facts mixed up or forget.
BRZOZOWSKI shows up in Bialystok area. You saw the surname distribution map.
BRZOZOWSKI in Bialystok's and Suwalki's business phone book. I go with BRZOZOWSKIhttps://www.infobel.com/en/poland
Every letter is pronounced in BRZOZOWSKI and different sound to BROSOWSKI in Polish.
Brzozowska, Anna Suwalki, Poland 58 1863-1864 1922
Brzozowski, Slanislaw Suwalki, Russia 18 1895-1896 1914
I go on several if not all Slavic boards to help out so have been around the block.
I'm in US in case you are wondering.