Wasn't Bruce a Bogus Beach Boy, as in not a "real" one?
He came in to replace Brian Wilson when he didn't want to tour anymore. First song he's audible in is "California Girls". He left, came back, and now tours as "The Beach Boys" with Mike Love. To me, calling yourselves "the Beach Boys" without a Wilson Brother onstage is like Ringo Starr billing his group "The Beatles."
Bruce is a real Beach Boy and has been one at least since "Pet Sounds."