I'd ask him if he's sure it's a nitro finish. Also, if he knows what model it is (SS-60, SS-40, etc).
It's possible that it has a really thin poly finish which is still okay. The Dimarzio VV pickups are alright but I prefer the old Tokai E-series.
Ask if he's put it under a black light, or if he's dabbed acetone in a control cavity to confirm that it's nitro.