Looking at purchasing this XFR - can anyone confirm if this sounds normal or if this could be the timing chain tensioner rattling?

Video links below:

​
​
Really appreciate any input.

Cheers

 

Your coolant is very low.
That rattle is louder on the side where the supercharger is, it sounds like the isolator coupler, it's a very common fault.

Turn off the car if you can hear like a bag of spanners as soon as you turn off, it's the coupler.

You can also run the car with the belt off the supercharger pulley, it will tell instantly, if it's the coupler.

 

0:55-0:59 on the second video does not sound normal. Could be chain slap. Doubt it's the coupler.

I would also concentrate on the cooling system when viewing it. Remove the engine cover and check the shape of the plastic coolant pipe. Check out @DeviLSh posts on the AJ133 cooling system.

 

The rattle sounds too deep and regular to me to be the coupler, the coupler rattle is much more irregular (like marbles in a tin can) and much higher pitched.
It sounds more like big end bearing noise to me but for your sake I hope not!