Correct, no one has confirmed that Andrew's biceps is 100% a problem that requires surgery.
However, it is undisputed that labrum repairs in athletes such as QBs or pitchers oftentimes require tenodesis: the repair of long head of the biceps/superior labrum.
The shoulder is a complicated joint, and when you play with a chronic labrum tear, as Luck did for several years, the mechanics of the shoulder change over time.
Due to the physiological changes (changes that can cause serious post-operative pain), sometimes tenodesis is required. That procedure consists of cutting the biceps tendon from its insertion into the shoulder and reattaching it to the proximal shoulder in a new location.
Hope that helps.