At the /etc/apt/sources.list.d directory exists the brave-browser-release.list file where the current content is:
deb [signed-by=/usr/share/keyrings/brave-browser-archive-keyring.gpg] https://brave-browser-apt-release.s3.brave.com/ stable main
and was upgraded to:
deb [signed-by=/usr/share/keyrings/brave-browser-archive-keyring.gpg arch=amd64] https://brave-browser-apt-release.s3.brave.com/ stable main
Observe the addition of arch=amd64 and solved. It thanks to the mentioned tutorial