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Bad install, bad bearing to start with. Blocked oil passage. Anything is possible.
Yes oil pressure should usually give you some indication.
If turbo isn't coming apart not much more that can cause that kind of noise. Fuel delivery or ignition issues usually don't sound like a bad rod. Could be quality of sound on vid but sure sounds like metal on my computer.
Air pumps can make really nasty noises especially when they shuck a seal. Parts get stuck in the ACV and cause rough running. Partially blocked exhaust will cause lack of top end power, but you would notice higher water temps when run for any length of time.
If you can get a hold of the old tape compression tester to use it gives you much better read out for diagnostic.
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