Kind of surprising but you are right, no mention of racking.
Apparently, since the wine is in secondary, the larger lees have already been racked off. What you are left with here are the finer lees, which is mostly dead yeast.
Some believe the clarifiers work better the more "stuff" is in the wine when they are added. These dual packet clarifiers work based on negatively and positively charged particles attracting each other and falling to the bottom.
In this case the wine will set on the fine lees until day 42.
I would follow the instructions.