Why does Poliquin not like bi's after back?

What is the reasoning for not doing biceps after backs and triceps after chest? It was mentioned in the latest LA Dawg.

It was also mentioned that he likes to alternate flexion/extension exercises. Read the 2nd half of the same sentence.

Poliquins recent stuff says that he doesnt care for working arms all that often. But if you do bis after back, your bis are already fatigued and cant handle as much work. The lift done earlier in the week and first in the workout is the one that gets the most benefit(Ian King).

Also if you notice a lot of Poliquin’s workouts have always been the pairing of antagonists with agonists. So this is not really a new thing form him to say. He just is specifically talking about arms this time.