1) Pakistan. YT comments say likely continued use with a bad harmonic balancer broke the #1 journal off that longer portion of crank. The short piece came from a donor crank.
2) It looks like oil enters the crankshaft at the main journals then goes through passages to the rod journals. Not splashed lubed. He copied the alignment of the oil hole on a good journal. So long as the hole he drilled intersects the passage to the #1 rod journal that is already in the short half, it will oil ok.
3) I see lots of controversy in the YT comments over whether this repair will last. Some say the break revealed slag from a prior weld, others say the 6013 rod that is near universally used in Pakistan for everything, won't be as strong as a better rod. Consensus seems to be this crank should now go into a lesser-stress application, a ditch pump or something rather than back in the overloaded truck that broke it.
4) Everybody in the comments agrees that this machinist's skill is extraordinary. Most agree this shop wouldn't stay in business if their work didn't hold up, so this repair will be satisfactory. (And is necessary, where replacement parts are simply unobtainable).