Lots of good info there as you notice one test was when engine had only 6,500 miles and newest test mileage was 27,600 miles thus about 21,000 miles had elapsed over 7 years with a ton of high RPM, 100 % engine loads bouncing off rev limiter
and by knowing the metals in engine gives us a good look inside as if any piston's ring land was broke, head or intake gasket leaking, no water or fuel found in sample, etc so for price of oil test of $22 tells us a lot about engine without having to get inside of the engine ourselves.
About 20 gallons of water, 20 gallons of methanol and maybe 5 gallons of WW fluid went through these cylinders with zero signs any of it got into the oil says the engine is sound.