Sorry, I should have translated that.
Actual landing numbers = the actual number of feet you'll chew up on landing.
Required landing numbers = factored numbers, at 66.7%.
So when you're doing preflight planning, the company will look at the required (factored) numbers for dispatch purposes.
When you're actually in flight, and looking up the data yourself, you should look at the actual numbers.
BUT, there's a caveat. If the braking action is reported below a certain level (good, in this case), OR if the captain believes that there is some reason that you need an additional margin in determining which numbers to use, then use the required (factored) numbers for an extra margin of safety.
Make more sense?
At a point, it's the book saying that it's your butt if something goes wrong because you didn't use the more conservative numbers.