Greetings. I'm the tech in Kai's video. My biggest concern is that even though toyota / lexus are warrantying engines due to debris, they will absolutely under no circumstances warranty anything else unless there's "visible" damage. This means the same turbos that have had debris going through the center cartridges will not be replaced.
We've had a v35a with absolutely wrecked camshafts and cam carriers which were replaced under warranty, but they would not let us replace anything else.
Best of luck to LX600 owners !
An update from the mechanic ft in the Tinkers adventure vid wayback when.