I have a different ...

I have a different perspective. 

If the superheater was manufactured without any metalworking oils and the manufacturer did not apply any protective coatings to the surfaces, then you might be able to allow the superheater to passivate during commissioning and normal operation IF you can confirm that there is no carryover and that the hydro test was conducted with deionized water.

If the superheater has oil residue or the hydro test was conducted with water quality that was NOT deioinized, - AND the superheater IS DRAINABLE - you will have to isolate the superheater and conduct a boil out procedure for oil or rinse the superheater with deionized water. 

If the superheater is not drainable - then you either have to clean the superheater before installation or take a risk and not clean or rinse the superheater. And, I hope that the superheater has an isolation valve so you can clean and passivate the boiler without having water enter the superheater.

Clean superheaters will passivate during normal operation. The challenge is - knowing if the superheater is clean.