My opinion is any damage from missing oil will show up immediately as knocking noise rather than revealing itself some time later.
For an engine to stop from lack of oil must mean a bearing picked up and seized, or possibly the friction in a piston grabbed but the governor would, I'd have thought, just added more fuel to overcome the friction until full power was not enough. So given the engine still runs with no apparent ill effects I'm wondering if the seizure was something other than loss of oil, overheating perhaps, and the oil loss was coincidental.
Bear in mind I know nothing about engines.