high mileage 2012 disco4 - run away?

Starting to look like good value these - the SDV6 HSE for anywhere between 12 and 15 grand depending on mileage.

Aren't these the ones though with a crank made of chocolate? How often do they fail/is it fairly inevitable and is there anything to look out for in the history that might suggest it won't fail (any precautionary measures)?

Also apart from the engine, what are the other possible disaster areas ...

So speaking to the specialist that also sells these they have sold hundred over the years but only had two fail.

And further details gleaned is that the earlier (2010ish) cars had a bad 'batch' of cranks when the failure was more prevalent and the latest ones only tend to fail if badly maintained / wrong oil used / thrashed.

What say the PH panel? The one I am looking at is a 2012 SDV6 HSE with 90k on and full main dealer and well known specialist history.

Also been told that a rebuild could be anywhere between 4 and 7K.