Transmissions are usually the main offenders. If it was replaced recently, it's probably fine though.
If it's an AWD XC90, the AWD system is sometimes left in a non-functional state and you're effectively getting a FWD car. Worth checking (and looking for AWD servicing in the logbooks). I'm not sure the easiest way to check AWD systems, someone else on here might know. If it were me I'd probably jack the car up and check that the rear wheels spin when the car is running.
212,000km isn't too much for a whiteblock motor, it should be fine if it's been taken care of.
Another common issue is that the PCV system is degraded or clogged and needs to be replaced. If you're getting the turbo replaced it would be a good time to replace the PCV system also (maybe $250 + labour). The PCV system is designed to allow pressurised gases in the bottom of the engine to escape and be drawn back into the intake to be burned safely. When it clogs, those gases are unable to escape and they end up forcing their way past the pistons, creating a condition known as blow-by. This presents itself as oil smoke from the exhaust when accelerating.
If you've owned an XC90 before, my advice would be to take it for a good test drive and just check that it drives and holds the road the way you expect, that the gearbox shifts smoothly but crisply, and that it doesn't flare out when changing gears. Flare-out is most noticeable when your foot is to the floor, and as the gearbox changes gear, the engine RPM spikes up for a moment then drops back down. This augurs a lot of wear in your gearbox.