I don't think that's extreme at all. It really depends on the type of weight and how you lift that makes the difference. Hell, not even a month ago I was burning through 30 sets of back work in 35 minutes! It was lighter weight and the rest periods were short (30 seconds), but you know what? I was pumped to hell. Also, it did not in any way hamper my training week. Did the same for arms.
Now if you wanna go balls out heavy, then maybe 30 sets in 35 minutes is crazy. But I can easily do that much in a 2 hour lifting session.
DB rows 8 x 6-8 ramping up weight
top weight Kroc row 1-2 x 20-25
face-pulls 4 sets
rear delt barbell row 4 sets
pull aparts 4 sets
Chins 5 sets + 2 second hold at top
That's about 26 sets +/- 1, I can get that done in an 90 minutes easy.
And I do deadlift work on another day, including more back work. I don't think that's extreme at all. Again, with Bonez, I'm not saying anybody but Ronnie should train like Ronnie, but come on, 30 sets in a week isn't that extreme.
Another split I used:
DB rows 8 sets ramping
Kroc row top set
Rack chins 4 sets
cable rows x 4 sets
T-Bar row x 4
pulldowns x 4
face-pulls x 4
low-trap rows x 4
That's 31-32 sets in a week, that's easy.