The total weight of the arrow is more important than the foc. Removing arrow weight just for foc is ridiculous.
The real trick is to actually go hunting and kill something. 
I think what he was eluding to is that you can gain FOC by designing the arrow to be lighter in the rear end and redistributing it to the front.
For numbers sake, 20grs removed from the rear could have the same effect as adding 75grs to the front.
This approach can help you get a high FOC without having a ridiculously heavy arrow. The higher the FOC goes the more point weight you need to add to make the FOC go up. Subtracting a small amount of weight from the rear can have a much greater effect in raising the FOC.
I have made a 1005gr arrow that I shoot from a 70#@28" Border Black Douglas recurve. From memory it has 660gr upfront and a 7" footing of 2020 aluminum shaft. The shaft is an Axis 5mm in 400 spine. The secret is the 7" footing. This allows the use of a light gpp shaft because the dynamic spine is increased dramatically because of the short flexible portion.