They're full of it; I've had a P95 for 13 years and about 3000 rounds now, and have lubricated it predominantly with CLP, along with some old Hoppe's/Castrol Synthetic Gun lube, Rem Oil and Hoppe's Oil from time to time.
That black nylon filled polymer is just about indestructible and doesn't change color at all- the only thing that does anything close is Birchwood Casey Gun Scrubber, which degreases it to the point that it looks a little different, but oiling it makes it look normal again.