Yes, I saw his reason when it he posted it. It is entirely valid for the P-38, but not at all for the Hurricane.
In the Hurricane the pilot never fired a burst. He pressed and released the trigger for the guns sending two 40mm shells towards his target, one from each gun. The guns fired at the same moment.
In the case of the P-38 it doesn't matter because there is no difference between pulse firing and stream firing when you get right down to it. Not with guns that have a 700rpm rate of fire.
In the case of the Hurri it has drastic effects because of the yaw. Furthermore guns that have a 40rmp rate of fire are not going to get unsynched nearly as rapidly, and holding to the one round per trigger press they'll never get unsynched.