I have been rehabbing my shoulder and speaking to friends with similar shoulder issues.
One of the better guides we have found was this guy: https://youtu.be/4Gli-tybcyw?si=6NwRkgrxFOXRZ641
His general approach is very cautious. His big issue is giving the tear better conditions to heal. Putting the arm in a sling whenever you can immobilizes joint and takes the pressure off the tear. Then strengthening the traps will fix things more than rotating the arms under load - because the ball of the joint will sit higher and more centred in the socket putting less stress on the tendons.
Can’t wait until the next debate when he can shield himself with a tinfoil hat.