I guess Nasser was your basic seated rows...pulldowns back trainer...like everyone at Venice in the 90's. No one likes doing bent overs or THE REAL T Bar rows.....not many gyms have those machines though.
You can't build one of the top 6 backs onstage by only doing pulldowns and cable rows. Nasser rarely did these movements, the back exercises he did most often were deadlifts (full or half-reps), barbell rows (both overhead and underhand grips), t-bar rows (without the chest pad), one-arm dumbell rows, weighted chinups (close-reverse, wide, and close-parallell grips), and dumbell pullovers. He also did, but less often, lat pulldowns (behind the neck and front), seated cable rows, straight-arm cable pulldowns, and hyperextensions. He trained back twice a week, usually in the 6-15 rep range.