Did he remember to keep the oil level between the marks on the dipstick? If he forgot about the oil for that long, wondering if he remembered to check his level!
Level is the real danger. Going 11 months and 22k is really not as bad as people think, as he obviously always got to operating temperature (not cold short trips).
Any chance you can capture some used oil, mid-stream, into a clean jam jar, and then get a Blackstone UOA kit? (Don't let it touch your old drain pan.)
And of course, cut and check the oil filter for tears, after that many miles, maybe the paper media OE filter couldn't handle it.
Pushing the limits are the most telling times.
I doubt the engine is hurt much at all as long as the oil level was maintained up.
Like others above have said, its risky to work on somebody else's car since they could blame you, but this is SIMPLE, and the SuperTech oil is a good choice. Not a Fram Ultra oil filter though, sad.