The plan has a built in taper for a major or “A” level event. The race is scheduled to occur at the ned of week 16.
On of the example bonus weeks is suggested for training between B or C level events where will not be tapering or when you have enough time (3 weeks) between A level events to do some really Capacity building training.
The other example mid season week is for when you are racing two important races with in a week. There is no time for real training and you just need to get recovered and do some maintenance.
I hope this answers your questions.