By chance i had a reply of the owner, he says it's just tint ( like lamin x ... ) with a demarcation for the red light ( 3 stripes ) , he doesn't precise if the tint was sold like that or if the stripes have been made before the laying.
The car looks great cause of the complete black mat 3M covering ( 2400 euros in France )
which match perfectly with the tail light
picture of the car before covering with already smoked striped tail light :
with black mat covering ( 3M )
In any case the striping with the tint looks really beautiful.