I can confirm my conclusion two ways:

...this image shows the carbonized remains of the rubber dampers atop the valves. They are original. Meaning they were never replaced because the camshaft had not been removed when the head was resurfaced. If the camshaft had been removed, the tappets would have also been removed; exposing the carbonized dampers. Replacement dampers are in a headgasket kit.

...total cam journal warpage/misalignment: 0.032in.
Head resurfacing: 0.020in.
head warp at this inspection: 0.012in.
0.020in plus 0.012in equals 0.032in.

The head resurfacing/headgasket replacement job was a waste of the customer's money because the job was done wrong. It was rushed; it was done half-a$$ed. The head was basically junk at the time of the first repair; but the shop was either too lazy ot too ignorant to fully evaluate the cylinder head.

This second overheating was a category 2 failure. But the headgasket itself was not the culprit. The dereliction of duty on the part of the repair shop and the machine shop set the stage for and predestined the headgasket failure.