Mine also has some rust issues, especially the rear differential case, CV shafts, skid plates, transmission mounts, exhaust hangers, etc. but it doesn't seem as bad as yours other than the skid plates which are definitely pitted and severely stained, I can't imagine it is a major expense to replace them down the road for esthetic reasons.
Mine was built 12/20 and I picked it up in Philly mid-january a week after it got there (sat outside in the snow for a few days) and drove it down to Miami with all the road salt, etc. I did wash the undercarriage as soon as I arrived and a couple more times thereafter.
The silver lining is the truck currently has 2300 miles on it and the rusting has not visibly worsened since it got to Miami and I washed it.
I have to spray it down with Salt-Away and hit the skid plates, differential, etc with a steel brush, scotch brite pad and some elbow grease. Then repaint the diff and skids with Rustoloum Rust-Reformer or POR 15 and coat the CV shafts, and other movable parts with Amsoil HDPD. I am just being lazy and haven't gotten around to it because it has not worsened (I think or should I say I hope) and I am too busy driving the $h!t out of it!!!
Did tell both the dealer I purchased it at and the servicing dealer here and both said it is normal and shouldn't cause any performance or safety issues other than being unpleasing to the eye (when you crawl under the truck) but it is registered on the record as a complaint just in case.
I agree it looks horrible and it is obviously concerning on a $65k plus vehicle but from my limited understanding it is not a safety or performance issue and you do have to be under the truck to see it. See if the dealership you purchased it from is willing to correct it and perhaps replace the skids, etc.
Good luck getting it resolved, keeps us posted on the progress.