Nothing happened to my shoulder its just not ideal posture due to sitting sleeping and life. I do a lot of work targeting my serratus anterior (and serratus anterior posterior) to help rotate my shoulders outwards and down. I come from a powerlifting background so I absolutely refuse to do kipping pullups, id rather just jerk myself off inbetween sets and call it grip training lol.
If god forbid you choose to start going down that darker path, maybe PM me for help. I'd rather anyone not hurt themselves then just be humble and ask questions.
If your going to recommend him SERM's and the like its pretty much guaranteed whatever he buys will not be legit unless he has some hollywood type connections lol. Just saying