If one refers to EU-OPS, Performance B one can see that the unfactored figures from the flight manual / POH have to be factored when calculating take-off distance etc.
The UK CAA has used net to describe the unfactored distances from the flight manual.
I agree that the wording is poor and also it is out of date when dealing with EU-OPS in light twins etc (Performance B). However, the intention of geting the average PPL to ad some safety factors to the unfactored distances in the Flight Manual / POH is good.
However, there are problems with PPLs who are on the CPL course who have to use different factors from what they used in the very same aircraft during the PPL course.