I read the title as saying "be careful when predicting tile penetration" based on one of the first point they make being that the method used to predict penetration "overpredicted penetration of tile coating significantly".
Though in fairness they then have sub points that kind of contradict this conclusion rather than support it.
But honestly this slide would make more sense if several of the sub points where top level independent statements instead.
> based on one of the first point they make being that the method used to predict penetration "overpredicted penetration of tile coating significantly".
That point read to me as if they completely overestimated the damage.