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The video on page 5 sounds like the hydraulic tappets.
Someone mentioned in this thread that they thought hydraulic tappet noise could only(?) happen when the engine's cold, although that is more likely, it can happen when the engine's really hot too, the oil's thinner & so can bleed off more quickly, it depends whether it's an issue with the oil getting into the follower or leaving it.
Btw, 'dry' engine rattle after an oil change is normal, pretty much every car does that I've ever worked on (IIRC), unless you can prefill the filter, that cuts it down a lot.
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