The rotors look the same on the other side, there is NO BARE ALUMINUM as you have stated over and over.
I know bare aluminum when I see it, at least give me that.
The brake cleaner I used is also citrius based, and I KNOW FOR A FACT I DID NOT REMOVE ANY OF THE COATING.
Here is a couple of personal jobs I did myself on OKK CNC .
The 29 is made of high grade aluminum and the original six hockey placks are from wood shelfs found in the tunnels in a now demolished GM plant.