They are Naked Advantages and displayed/written up as such, though the Resilient Body is done in a confusing manner.
A +1/2 Naked Advantage (Resistant, in this case) applied to a max of 50 points (say, 25PD/25ED) costs 25 points.
A +1/4 Naked Advantage (Hardened, in this case) applied to a max of 75 points (say, 25PD/25ED with +1/2 Resistant applied to them) costs 19 points. This differs from what is shown by 1 point - likely a rounding error or typo on the part of the writer for that particular example.
I would argue that the second writeup (Resilient Body) is done incorrectly as it should be applied to the base ability (25PD/25ED) and not the Advantaged ability (25PD/25ED with Resistant). If you purchase both Hardened and Resistant as the same Naked Advantage on 25PD/25ED, the cost will work out to 37 points, which is the 25 points for Resistant and 12 points for Hardened applied to up to 25PD/25ED.
Edit: the other costs for Hardened as a Naked Advantage work out to exactly what is shown if applied to the Advantaged cost of PD/ED with Resistant...but Naked Advantages are applied to the Base Cost of the ability, so I would recommend ignoring the costs listed with Resilient Body and either purchase as a single Naked Advantage or purchase as Hardened applied to the Base Cost (non-Advantaged) of the relevant levels of PD/ED.