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That's more of an engine test than an oil test IMO.
If the coolant, oil, and combustion chamber temps are safe and stable, and engine should be able to run at WOT for a long, long, time - no matter what oil is in it. Excess heat build-up is a big problem, that's an engine design issue, but most engines aren't designed with extended WOT running in-mind. That engine was started cold once, and ran directly up to (maybe beyond) operating temp and sat there.
"Extreme Conditions" to me means having a car sitting outside in winter temps, running to the store or work 2mi away, turning it off, starting it up, and driving back. That's what contaminates oil and shortens your change interval.
Most of the time our engines operate closer to that scenario than the "Maximum Endurance Test" one.
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