https://www.britannica.com/topic/Native-American/Assimilation-versus-sovereignty-the-late-19th-to-the-late-20th-century

《In other cases, however, claims to indigenous heritage have proved bogus, and recognition has been denied.》

OK, I gotta say I’m a bit disappointed with Britannica here. “Bogus” seems like slang; why not “spurious” or “specious”?