Why does everyone think that the music in the Bailey's Shake advert is by Carmen Miranda...?

The music in question is not by Carmen Miranda and is not the song by her called Chika Boom Chicka Boom... instead if you listen to the words of the song it is actually Boom Pacha Boom, this song was done by Billy Byrd and his Penguins and the female singer is sadly unknown as she was not a member of the group and only sang with them for that 1 number...