Agree!

My first thought,,,especially with the piiiiiinnnggg followed by engine barely running,,,however not certain why drop of oil pressure,,,,except if timing chain totally sheared,,,which is possible after a few additional turns of the engine.

Doubt that a single failed rocker/pushrods/lifter would cause the few moments of excessively poor performance before shutdown, but could cause loss of oil pressure if lifter popped out I guess.