If you were to use this structure you'd have to feel things out.
Load wise feel free to use 90-100% for the very heavy days, 80-90% for the heavy, and 70-80% for the moderate. It depends on the reps you're going for and your condition of the day.
For progression, pick a max and run with it. If you're a novice-intermediate you may able to add some pounds during the cycle and increase intensity.
Honestly the article lays out a very barebone strucutre without much detail. You can probably find other programs which follow a similar principle of manipulating intensity throughout the cycle.
If you stick with it make sure to not forget the bigger picture: set goals, increase effort/challenge gradually and make sure to get adequate rest.