would not touch it myself.

First of all he does not state what turbo it actually is other than saying stage 2, he says its good for 190+bhp but then again the standard turbo is good for this kind of power.

If its a new turbo which retailed at £400 when he purchased it, then he's had it a long time as brand new roller bearing turbos are more expensive than that, if the item was a rebuild he does not state so or how long the rebuild was.
It is stated that it was built by airesearch however does this simply mean its a Garrett Air Research turbo or that a specialist company by that name rebuilt it to stage two.
He states it has a uprated actuator without stating what its uprated to.

No technical information presented at all, it does not clarify if its ever been on a car, it sounds like a ebay special to me