Yes and also stable isn't the only maintained branch of Chromium, there's also extended stable (currently 146.x). LTS exists too (144.x), but I believe it's meant only for ChromeOS.
The Vivaldi build I have locally explicitly mentions "Extended Stable channel (may also include additional security patches)" on its "About" page.
The Vivaldi build I have locally explicitly mentions "Extended Stable channel (may also include additional security patches)" on its "About" page.