Yes a s the 3x3 just refers to the 3 weeks %’s.
Why don’t you run the basic program in the link I added for 2 cycles (6 weeks) just to get a handle on the %s and TM. Then you could progress to 5’s pro for 2 cycles (6 weeks). By then you’ll be used to the % and structure of the cycle and it may make a bit more sense. You won’t have lost anything, if anything you may find you progress well even on the basic program. After all it was good enough to help many others get strong.