That gentleman's bicep, in the video, is impressive due to his small wrist size. His bicep peak is a genetic gift, though not discounting the effort he made to bring it out. If born with different bicep inserts/length/shape, giving more of a flat appearing bicep, than a high peak will not be obtained. Not to say a person will never have large and impressive arms through hard work and making the most of the potential he was born with. Actually his forearms are almost as impressive.
His movements may be considered hybrids in there performance. BB'ers are always very inventive in their pursuits.
As we know, that's not a real drag curl (Gironda or any other style). Gives a extreme load on the biceps when done the right.
The rowing part, ending with a almost standing position, is a old standby for very experienced weight men. Might call it a row-high pull combo. Guy's can use either a curl or over hand grip. It can be a mass builder for the total back. Even the biceps.
His tricep BB extensions with a combo with the pullover could be rewarding. Actually seen this before, in a few gym's. The key to this may be the stretch from the pullover. By themselves pullovers (bent arm..as in the video) are a superior movement for the triceps. Pullovers (BB or DB) have been a favorite for me for many years. Will usually add a press off the chest each rep (pullover & press) which even adds more recruitment from the triceps, delts and pecs.
Good luck
