The data sheet for the AD8031 only has capacitive drive plots to 1nF.
In Circuit note CN-0277, the AD8031 is being used because it can drive large capacitive loads.
In the circuit there are two 0.1uF (100nF) capacitors connected to its output with no isolation resistor.
Can the AD8031 drive this kind of load without stability problems?
OK, I found this post which provides an answer: