He also writes in the same article:
"Remember that the assistance work must NOT be trained with the same ferocity as the main lifts. You shouldn't be doing curls and rows with the same effort as you would squat. This doesn't mean they aren't important, it means you have to divvy up your effort when you train as there's a finite amount to go around.
If you feel you're burning out due to the assistance work, this is your own fault. Warm-up, do some jumps, do the main lift hard and with extreme focus, then move on to the assistance work."
It is only assistance and wont burn you out when you get used to it. If you feel like burning out, do lighter exercises, of start with less reps or something. You don't try to exhaust yourself with db benches.