HyperLoc 300

In my instructions for my HL, It calls for:
Make a mark 11″ from the end of the motor mount tube along the
air frame and drill the overflow tube hole using a 3/8″ drill bit making
sure to extend the hole from the outside of the air frame into the
motor mount tube.

This is a 54mm motor mount tube. The rocket is Hybrid ready. A longer
motor mount.

Is this hole required if I am not going to use Hybrid?

This is a stock build, no modifications.