Here's a little better explanation. Here's a couple charts that explain the percentages.
The first one is how long a given fatigue percentage for one exercise takes to recover from. The second chart would be if you added all of them up for a given week.
In the volume week they'll be higher and taking more weight off the bar will allow more back off sets before you reach your initial RPE. This will accumulate volume. In the second week you'll see the percentages are lower, so you'll take less weight off the bar and they'll be heavier, so you won't get as many sets before you reach your RPE goal. Less reps per set, too. Less volume. The third week is moderate volume, but at the highest intensity. This is your mini peak.
Looking at the recovery time on the charts you'll see that sometimes you won't recovery in time for the next session. This accumulates fatigue and causes you to overreach, then when you slash the volume back and your body finally recovers you supercompensate and this is when you display the new strength you've built up while accumulating volume. This is how peaking works and eventually you'll want to stretch this process out. If you're several months out you'll program a longer volume block and transition into less volume and more intensity as you get closer to the meet and hopefully peak at the meet and display the strength you've built up.
Anyway, long post and you didn't actually ask, but knowing the hows and whys is only going to help you get the most out of it.