That's the right call, since WIS's "Busch Stadium II" clearly refers to the current Busch, which didn't exist until the 2006 season. bb-ref refers to the previous Busch as "Busch Stadium II" (Cardinals moved from Sportsman's IV to Busch II when it opened midway through the 1966 season), but I haven't been able to figure out what "Busch Stadium I" is.